Helicopter
David, 1919, Aircraft, p. 25:
The helicopter is a machine which theorists of that school believe can fly straight up into the sky byecause its air screw propeller works on a vertical axis. This type of aircraft has never been successful, for the reason that the propeller does not lift. It simply pulls a stream-lined surface through the air. The lifting must be done by planes.
Early history
Gibbs-Smith, Aviation, 1970, p. 16:
The model helicopter—in use certainly since the 14th century as a toy—has recently been claimed by the Russian authorities to have been revived in 1754 with a twin contra-rotating rotor model operated by clockwork, made by the well-known scientist Michael Vasilyevitch Lomonosov, which is said to have flown successfully: but we have no documents. In 1768 the French mathematician, A. J. P. Paucton, in his Théorie de la Vis Archimède, suggested a man-carrying and man-powered helicopter with two helical screws (ptérophores), one to sustain it and the other to propel it: it was never built. But, oddly enough, this must rank was the first specific suggestion for horizontal aerial propulsion by an airscrew.
A source says the term was invented this way:
The word "helicopter" was coined in 1861 by Viscount Ponton d'Amécourt by combining the Greek words "helix" and "pteron".
Enclosing categories | Aircraft, Propulsion |
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Subcategories | |
Keywords | Propeller, USPC 244/17.11, CPC B64C27/00, CPC B64C29/00, CPC G05D1/0858 |
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End year |
This wiki has 302 patents in category "Helicopter".
Other techtypes related to Helicopter: AU 90.3, CA 244/15, CA 244/16, CA 244/17, CA 244/18, CA 244/19, CA 244/20, CA 244/5, CA 244/6, CPC B64C, CPC B64C27/04, CPC B64C27/06, CPC B64C27/26, CPC B64C29/00, CPC B64C29/0025, CPC B64C29/0066, CPC B64D2700/62587, CPC G05D1/0858, DE 77, Helicoplane, IPC B64C, NZ 90.3, USPC 244, USPC 244/17.11, USPC 244/17.17, USPC 244/26, USPC 244/6, USPC 244/7
Patents in category Helicopter
- Patent US-1849-Smith (English title: Helicopter, Inventors: Henry J. Smith)
- Patent US-1861-33797 (English title: Apparatus for Navigating the Air, Inventors: Watson F. Quimby)
- Patent US-1880-PAMPHLET (English title: Helicopter, Inventors: Thomas Alvin EDISON)
- Patent US-1885-pn (English title: Helicopter, Inventors: Richard George OWEN)
- Patent HU-1895-3392 (English title: Helicopter, Inventors: Bahily János)
- Patent FR-1896-255717 (English title: Lifting propeller for aircraft, Inventors: Rudolph Kosch)
- Patent US-1896-pt (English title: Man-powered helicopter, Inventors: Rudolph Kosch, Supplementary to patent: Patent GB-1896-9129 • Patent DE-1896-89860)
- Patent RU-1905-Rebikov (English title: Helicopter, Inventors: Vassily Rebikov)
- Patent ??-1885-ao (English title: Propeller plane, Inventors: Ayres, Filing date: 1885)
- Patent DE-1896-95963 (English title: Steerable airship without rudder, Inventors: Alexander Schörke, Filing date: 1896-04-22)
- Patent GB-1905-15698 (English title: Improvements to flying machines, Inventors: Edwin Richard Mumford, Filing date: 1905-08-01)
- Patent GB-1917-113371 (English title: Helicopter on aeroplane, Inventors: Alfred William Turner • Walter Fisher Luff, Filing date: 1917-04-30)
- Patent US-1859-pl (English title: Counter rotating helicopter, Inventors: Henry BRIGHT, Filing date: 1969-12-31)
- Patent US-1913-1052378 (English title: Flying-machine, Inventors: Edgar Eugene Porter, Filing date: 1969-12-31)
- Patent FR-1855-13038 (English title: Helicopter, with precise aperture and other detailed information also included within patent(?), as inferred from cross-referencing of IPC and CPC classification, Filing date: 1855-02-27)
- Patent GB-1859-2330 (English title: Apparatus for navigating the air, Inventors: Henry Bright, Filing date: 1859-10-12)
- Patent US-1860-32378 (English title: Balloon or aerial car, Inventors: Mortimer Nelson, Filing date: 1860-10-01)
- Patent FR-1863-66378 (English title: Dirigible called aerostat-helicopter-deminne, Inventors: Deminne, Filing date: 1863-12-29)
- Patent GB-1867-1392 (English title: Flying machine, Inventors: William Smyth, Filing date: 1867)
- Patent DE-1879-10842 (English title: Flying machine, Inventors: Julius Griese, Filing date: 1879-12-07)
- Patent US-1886-354413 (English title: Balloon, Inventors: Otto Hartung, Filing date: 1884-09-10)
- Patent RU-1888-Raziewitsch (English title: Helicopter, Inventors: Raziewitsch, Filing date: 1888)
- Patent CA-1890-34397 (English title: Flying toy, Inventors: Ernest G. Knaepfel • Louis L. Lichtfield, Filing date: 1890-03-10)
- Patent GB-1896-3657 (English title: Aerial Machine, Inventors: James Dennis Roots, Filing date: 1896-02-18)
- Patent GB-1896-9129 (English title: Combined screw propeller and aeroplane, for raising, lowering, and sustaining airships, Inventors: Rudolph Kosch, Filing date: 1896-04-30)
- Patent DE-1896-98109 (English title: Changeover device for flight devices, possibly a helicopter capable of landing on earth or water, Inventors: Dr. Bernhard Reinhard Beenen, Filing date: 1896-05-05)
- Patent GB-1897-9864 (English title: Flying Machines, Inventors: Dr. Bernhard Reinhard Beenen, Supplementary to patent: Patent DE-1896-98109, Filing date: 1897-04-20)
- Patent HU-1897-9450 (English title: Steerable blimp, Inventors: Gustav Fricke, Supplementary to patent: Patent GB-1897-10811 • Patent FR-1897-266527, Filing date: 1897-05-05)
- Patent FR-1897-262832 (English title: Aviation apparatus, apparently a helicopter capable landing on water or earth, Inventors: Dr. Bernhard Reinhard Beenen, Supplementary to patent: Patent DE-1896-98109, Filing date: 1897-06-01)
- Patent HU-1898-13443 (English title: Adjusting devices for aeroplanes (translation skewed by modern usage) actually a helicopter capable of landing on sea or earth, Inventors: Dr. Bernhard Reinhard Beenen, Supplementary to patent: Patent DE-1896-98109, Filing date: 1898-07-21)
- Patent AT-1900-9694 (English title: Double screws - Propellers for flying machines, likely lift propellers, likely helicopter, Inventors: Emanuel Kalisch, Filing date: 1900-06-22)
- Patent DE-1900-128658 (English title: "Screw wing arrangement", absolutely propellers; this may be a helicopter, Inventors: Emanuel Kalisch, Filing date: 1900-06-24)
- Patent CH-1902-23691 (English title: Helicopter or airship flying aircraft heavier than air, powered by propellers, Inventors: Maurice Léger, Supplementary to patent: Patent HU-1901-22471)
- Patent IT-1901-58652 (English title: Helicopter, or steerable heavier-than-air flying apparatus moved by propellers, Inventors: Maurice Léger, Supplementary to patent: Patent HU-1901-22471, Filing date: 1901-02-20)
- Patent HU-1901-22471 (English title: Helicopter, "Steerable aircraft powered by wing screws", Inventors: Maurice Léger, Filing date: 1901-02-20)
- Patent GB-1901-3691 (English title: Helicopter, Inventors: Maurice Léger, Supplementary to patent: Patent HU-1901-22471, Filing date: 1901-02-20)
- Patent DE-1901-141019 (English title: Flight-apparatus, Inventors: Maurice Léger, Filing date: 1901-02-21)
- Patent ES-1901-27364 (English title: A directable flying apparatus, heavier than air, moved by propellers "Helicopter", Inventors: Maurice Léger, Supplementary to patent: Patent HU-1901-22471, Filing date: 1901-04-01)
- Patent GB-1901-18862 (English title: Aeronautical machine, Inventors: Charles Tuckfield, Filing date: 1901-09-21)
- Patent LU-1901-4297 (English title: "Helicopter" or steerable heavier-than-air flying machine powered by propellers, Inventors: Maurice Léger, Filing date: 1969-12-31)
- Patent AT-1903-12702 (English title: Helicopter "Flying apparatus", Inventors: Maurice Léger, Supplementary to patent: Patent HU-1901-22471, Filing date: 1969-12-31)
- Patent US-1903-727377 (English title: Flying-machine, Inventors: Otto A. Kaehler, Filing date: 1902-01-18)
- Patent GB-1902-13499 (English title: Steerable Flying Machine, Inventors: Alfred K. R. A. Krakow, Supplementary to patent: Patent FR-1902-324521, Filing date: 1902-06-14)
- Patent DE-1902-139493 (English title: Dynamic flying machine (Ring flyer), Inventors: Georg Wellner, Filing date: 1902-07-08)
- Patent US-1913-1050980 (English title: Aerodrome, Inventors: Samuel D. MOTT, Supplementary to patent: 1902-09-30, Filing date: 1969-12-31)
- Patent US-1913-1050980 (English title: Aerodrome, Inventors: Samuel D. MOTT, Supplementary to patent: 1902-09-30, Filing date: 1969-12-31)
- Patent HU-1903-29342 (English title: Aircraft, actually quite likely a helicopter, Inventors: Antoine-Padoue Filippi, Supplementary to patent: Patent FR-1902-326727, Filing date: 1903-01-23)
- Patent US-1904-766021 (English title: Flying machine, Inventors: Stephen Merrill Craig, Filing date: 1903-06-18)
- Patent FR-1903-334526 (English title: Helicopter self-steering, with movable axes for propulsion and direction in all directions, applicable to aircraft, submarines, etc., Inventors: Joseph Monpelas de Dax, Filing date: 1903-08-08)
- Patent FR-1904-349169 (English title: Apparatus for imparting movement to airplanes horizontally or vertically, Inventors: Gustav Knäpper, Supplementary to patent: Patent DE-1903-160742, Filing date: 1904-11-17)
- Patent DK-1905-7878 (English title: Apparatus for imparting horizontal or vertical movement to airborne objects, Inventors: Gustav Knaepper, Supplementary to patent: Patent DE-1903-160742, Filing date: 1904-12-07)
- Patent GB-1905-3214 (English title: Aerodromes or Flying Machines, Inventors: Edwin Richard Mumford, Filing date: 1905-02-16)
- Patent US-1905-851683 (English title: Navigable aeroplane, Inventors: Benjamin F. Mickley, Filing date: 1905-05-13)
- Patent HU-1905-34770 (English title: Helicopter, Inventors: Bahily János • Marschall Antal, Filing date: 1905-05-24)
- Patent US-1905-908794 (English title: Aeronautic apparatus, Inventors: George Alphonzo Metcalf, Filing date: 1905-10-16)
- Patent CA-1906-98826 (English title: Air Ship, Inventors: Ignazio Perugini, Filing date: 1905-12-19)
- Patent US-1909-926804 (English title: Flying machine, Inventors: Lafayette J. Brown, Filing date: 1906-02-05)
- Patent FR-1906-363081 (English title: Helicopter, Inventors: Joseph Wetzel, Filing date: 1906-02-08)
- Patent FR-1906-364200 (English title: Process for ensuring the balance of airplanes or helicopters, Inventors: Marius Latour, Filing date: 1906-03-01)
- Patent US-1907-860447 (English title: Flying machine, Inventors: William Harvey Cook, Filing date: 1906-03-06)
- Patent GB-1906-6502 (English title: Helicopter-Airplane, Inventors: Vassily Rebikov, Supplementary to patent: Patent RU-1905-Rebikov, Filing date: 1906-03-17)
- Patent US-1906-844172 (English title: Aeronautical machine, Inventors: Alexander McCarthy, Filing date: 1906-03-17)
- Patent US-1908-875787 (English title: Flying or air car, Inventors: Selden Allen Day, Filing date: 1906-05-16)
- Patent FR-1906-367532 (English title: Helicopter, Inventors: Georges-Pierre-Joseph Brousseau, Filing date: 1906-06-15)
- Patent FR-1906-367357 (English title: Helicopter, Inventors: Henri de Lostalot, Filing date: 1906-06-22)
- Patent HU-1906-38048 (English title: Aircraft, Inventors: Henri de Lostalot, Supplementary to patent: Patent FR-1906-367357, Filing date: 1906-06-30)
- Patent FR-1906-369855 (English title: Air-Ship, heavier-than-air, specifically not an airplane, an aircraft using a vertical airscrew for elevation, Inventors: Joseph Maes, Filing date: 1906-07-03)
- Patent ES-1906-38661 (English title: A heavier-than-air aircraft, Inventors: Joseph Maes, Supplementary to patent: Patent FR-1906-369855, Filing date: 1906-07-07)
- Patent US-1908-892380 (English title: Flying-machine, Inventors: Edwin Richard Mumford, Supplementary to patent: Patent GB-1905-15698, Filing date: 1906-07-11)
- Patent FR-1906-369683 (English title: Helicopter, Inventors: Désiré Sival, Filing date: 1906-08-30)
- Patent FR-1906-369683.6785 (English title: Helicopter, Inventors: Désiré Sival, Supplementary to patent: Patent FR-1906-369683, Filing date: 1906-10-18)
- Patent BE-1906-12-18 Émile Dupont (English title: Two-propeller helicopter or airplane, Inventors: Émile Dupont, Filing date: 1906-12-18)
- Patent US-1907-861740 (English title: Flying-machine, Inventors: Edward M. La Penotiere, Filing date: 1906-12-24)
- Patent DE-1907-202812 (English title: Propeller screw which can be adjusted indepenently from the drive shaft, Inventors: Harry Martin Middleton, Supplementary to patent: Patent GB-1906-1436, Filing date: 1907-01-15)
- Patent US-1908-897738 (English title: Flying-machine, Inventors: Winne GORDON, Filing date: 1969-12-31)
- Patent US-1907-883090 (English title: Flying-machine, Inventors: Homer J. Cragun, Filing date: 1907-03-06)
- Patent US-1911-999337 (English title: Helicopter hybrid, Inventors: Vassily Rebikov, Supplementary to patent: Patent RU-1905-Rebikov, Filing date: 1907-03-09)
- Patent FR-1907-375606 (English title: Gyroplane, Inventors: Louis Bréguet, Filing date: 1907-03-11)
- Patent GB-1907-12848 (English title: Improvements to apparatus for aerial navigation, Inventors: Henri de Lostalot, Supplementary to patent: Patent FR-1906-367357, Filing date: 1907-06-03)
- Patent US-1907-942691 (English title: Gyroscopic aeroplane, Inventors: Sydney S. Williams, Filing date: 1907-07-01)
- Patent US-1908-879779 (English title: Air-ship, Inventors: Edgar F. Leeds, Filing date: 1907-07-05)
- Patent FR-1907-380581 (English title: Two-propeller helicopter or airplane, Inventors: Émile Dupont, Supplementary to patent: Patent BE-1906-12-18 Émile Dupont, Filing date: 1907-08-06)
- Patent FR-1908-392865 (English title: Helicopter, Inventors: Jules Puget, Filing date: 1907-10-08)
- Patent FR-1907-394126 (English title: Device for airplane, actually a helicopter, Inventors: Jules Collomb, Filing date: 1907-11-18)
- Patent US-1913-1050654 (English title: Flying-machine, Inventors: John P. Holland, Filing date: 1907-12-02)
- Patent DE-1907-221458 (English title: Helicopter with movable parachute, Inventors: Otto von Krempelhuber, Filing date: 1907-12-19)
- Patent US-1909-937187 (English title: Helicopter, Inventors: Benjamin F Seymour, Filing date: 1908-01-09)
- Patent DE-1908-206440 (English title: Hang glider with adjustable lifting screws, Inventors: Herbert Schultze, Filing date: 1908-01-09)
- Patent FR-1908-386615 (English title: Helicopter, Inventors: Joseph Frossard, Filing date: 1908-01-28)
- Patent US-1909-932712 (English title: Airship, Inventors: Enoch S Le Fevre • William David Le Fevre, Filing date: 1908-02-20)
- Patent FR-1908-387928 (English title: Aerial locomotion apparatus, Inventors: Joseph Chantraine, Supplementary to patent: Patent BE-1907-198483, Filing date: 1908-03-07)
- Patent IT-1908-94537 (English title: Aerial locomotion apparatus, Inventors: Joseph Chantraine, Supplementary to patent: Patent BE-1907-198483, Filing date: 1908-03-07)
- Patent IT-1908-94217 (English title: Helicopter using parabolic propeller, with methods for launch and parachute, Inventors: Achille Bertelli • Achille Bertelli fu Alessandro, Filing date: 1908-03-09)
- Patent GB-1908-5310 (English title: Improvements in flying machines, Inventors: Joseph Chantraine, Supplementary to patent: Patent BE-1907-198483, Filing date: 1908-03-09)
- Patent FR-1908-399206 (English title: Maritime and aerial lift-propeller, Inventors: Pierre-Pie Cazaux, Filing date: 1908-04-15)
- Patent FR-1908-389974 (English title: Flying machine, Inventors: Louis Kloos, Filing date: 1908-05-07)
- Patent US-1909-910488 (English title: Aerial navigating apparatus, Inventors: John Bernard, Filing date: 1908-06-30)
- Patent US-1909-910773 (English title: Flying-machine, Inventors: Heinrich Bea, Filing date: 1908-07-03)
- Patent FR-1909-401416 (English title: Equipment for combined airplane and helicopter, Inventors: Marc-Lucien-Gustave Damet, Filing date: 1908-07-22)
- Patent FR-1908-393997 (English title: Helicopter, Inventors: Désiré Sival, Filing date: 1908-09-05)
- Patent US-1909-909681 (English title: Air-ship, Inventors: William Rumble, Filing date: 1908-09-10)
- Patent FR-1908-394254 (English title: Airplane, actually helicopter or hybrid, Inventors: Jean Desbois, Filing date: 1908-09-11)
- Patent US-1909-937587 (English title: Aeroplane, Inventors: David S. Foster, Filing date: 1908-09-17)
- Patent AU-1908-12779 (English title: Aeromobile, Inventors: Charles Launcelot Garland, Filing date: 1908-10-14)
- Patent FR-1909-395367 (English title: Flying machine "hélicoplane", Inventors: Dominique-Louis Barbe, Filing date: 1908-10-17)
- Patent US-1909-914969 (English title: Aeroplane, Inventors: Henry Mueller, Filing date: 1908-10-31)
- Patent US-1908-970616 (English title: Flying-machine, Inventors: Thomas Alva Edison, Filing date: 1908-11-16)
- Patent IT-1908-98977 (English title: Propelling and sustaining helix for airplanes, helicopters, and the like, Inventors: Azeglio Pineschi • Lamberto Pineschi, Filing date: 1908-11-21)
- Patent FR-1908-407090 (English title: Helicoplane-parachute, Inventors: Charles Wolf, Filing date: 1908-12-21)
- Patent GB-1908-13809 (English title: Improvements to aerial machines, Inventors: Christian Lorenzen, Filing date: 1908-12-30)
- Patent FR-1909-394254.10394 (English title: Airplane, actually helicopter or hybrid, Inventors: Jean Desbois, Supplementary to patent: Patent FR-1908-394254, Filing date: 1909-01-26)
- Patent FR-1909-398288 (English title: Aerial helicopter, Inventors: George Alphonzo Metcalf, Filing date: 1909-01-05)
- Patent FR-1909-407090.11558 (English title: Helicoplane-parachute, Inventors: Charles Wolf, Supplementary to patent: Patent FR-1908-407090, Filing date: 1909-01-11)
- Patent DE-1909-250960 (English title: Aircraft with parachute-like arrangement of airscrews, Inventors: Christian Lorenzen, Supplementary to patent: Patent GB-1908-13809, Filing date: 1909-01-16)
- Patent US-1909-1014643 (English title: Aerial vessel, Inventors: John J. Donnelly, Filing date: 1909-01-18)
- Patent FR-1909-400167 (English title: Monoplane helicopter with variable surface, Inventors: Michel Laplace, Filing date: 1909-01-30)
- Patent US-1909-943732 (English title: Air-Ship, Inventors: Amiel Bratschie, Filing date: 1909-02-04)
- Patent AT-1909-40038 (English title: Flying machine emphasizing adjustable propellers aiding both in propulsion and ascension, Inventors: Wilhelm Kress, Filing date: 1909-02-23)
- Patent FR-1909-407090.11560 (English title: Helicoplane-parachute, Inventors: Charles Wolf, Supplementary to patent: Patent FR-1908-407090, Filing date: 1909-03-24)
- Patent FR-1909-380581.10732 (English title: Supplement to patent of Aug 6, 1907 for airplanes or helicopters with two propellers, Inventors: Émile Dupont, Supplementary to patent: Patent FR-1907-380581, Filing date: 1909-03-25)
- Patent FR-1909-407090.11561 (English title: Helicoplane-parachute, Inventors: Charles Wolf, Supplementary to patent: Patent FR-1908-407090, Filing date: 1909-04-28)
- Patent GB-1909-12556 (English title: Flying Machines, Inventors: Thomas Augustus Dring, Filing date: 1909-05-27)
- Patent HU-1909-47942 (English title: Flying Machine, actually a helicopter, Inventors: Frigyes Sander, Filing date: 1909-05-27)
- Patent US-1909-964957 (English title: Flying-machine, Inventors: Halvor Olsen Eiane, Filing date: 1909-06-01)
- Patent US-1910-947802 (English title: Airship, Inventors: Arthur Crane, Filing date: 1909-06-01)
- Patent US-1910-958747 (English title: Flying machine, Inventors: John Koskine, Filing date: 1909-06-14)
- Patent US-1909-984270 (English title: Flying-machine, Inventors: Albert Hugo Friedel, Filing date: 1909-06-23)
- Patent FR-1909-407090.11562 (English title: Helicoplane-parachute, Inventors: Charles Wolf, Supplementary to patent: Patent FR-1908-407090, Filing date: 1909-06-26)
- Patent US-1911-991794 (English title: Flying-machine or airship, Inventors: Daniel P. McLaughlin, Filing date: 1909-06-30)
- Patent US-1909-983707 (English title: Aeroplane, Inventors: John W. L. Harrell • John Dailey, Filing date: 1909-07-30)
- Patent US-1909-976161 (English title: Flying-machine, Inventors: Silas H. French, Filing date: 1909-08-04)
- Patent HU-1909-49569 (English title: Airplane, or aircraft likely hybrid helicopter, Inventors: Antal Weczera • István Windisch, Filing date: 1909-08-05)
- Patent US-1910-978375 (English title: Flying machine, Inventors: Horace G. Hill, Filing date: 1909-08-13)
- Patent FR-1909-394254.11463 (English title: Aeroplane, actually a helicopter or hybrid, Inventors: Jean Desbois, Supplementary to patent: Patent FR-1908-394254, Filing date: 1909-08-31)
- Patent BE-1909-219377 (English title: Concentric circular wings with contrary movements, Inventors: Alexis Beurrier, Filing date: 1909-09-22)
- Patent FR-1910-409229 (English title: Helicopter with variable propeller inclination, Inventors: Raymond Talmié • Achille Derazey, Filing date: 1909-09-27)
- Patent US-1910-979472 (English title: Flying-machine, Inventors: Fred Goehner, Filing date: 1909-09-27)
- Patent GB-1909-22162 (English title: Aeromobile, Inventors: Charles Launcelot Garland, Supplementary to patent: Patent AU-1908-12779, Filing date: 1909-09-29)
- Patent AU-1909-16062 (English title: Safety aeroplane flying machine, Inventors: Edward Temple, Filing date: 1909-10-14)
- Patent US-1909-991686 (English title: Apparatus for aerial navigation, Inventors: Jean M. Allèas, Filing date: 1909-10-21)
- Patent GB-1909-24888 (English title: Aerial Machines, Inventors: Ernest Lister, Filing date: 1909-10-29)
- Patent US-1910-955049 (English title: Air-Ship, Inventors: Gustave H. Brekke, Supplementary to patent: FR 527306, Filing date: 1909-11-10)
- Patent FR-1909-420315 (English title: Aviation, Inventors: Jean-Jacques-Élie Farcot, Filing date: 1909-11-19)
- Patent US-1913-1054798 (English title: Dirigible flying-machine, Inventors: Benjamin F. Seymour, Jr., Filing date: 1909-12-03)
- Patent DE-1909-247221 (English title: Hang glider with lifting screw, Inventors: Gustav Mees, Filing date: 1909-12-08)
- Patent US-1909-985925 (English title: Aero-traveler, Inventors: John H. Nolan, Filing date: 1909-12-29)
- Patent US-1910-959266 (English title: Aerial ship, Inventors: Frederick W. Schroeder, Filing date: 1910-05-24)
- Patent AU-1909-18014 (Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556, Filing date: 1910-05-25)
- Patent US-1910-977997 (English title: Flying-machine, Inventors: Edward BERTHOLF, Supplementary to patent: Wheels, Filing date: 1969-12-31)
- Patent US-1911-989490 (English title: Aerial apparatus of the heavier-than-air class, Inventors: John J. DONNELLY, Supplementary to patent: 1911-04-11, Filing date: 1969-12-31)
- Patent ES-1910-48007 (English title: Flying machine, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556)
- Patent IN-1910-262 (Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556)
- Patent MX-1910-10155 (English title: A helicopter aircraft, Inventors: Juan García Villalobos)
- Patent MX-1910-10953 (English title: An air ship, Inventors: William Everett Sylvester Coyne)
- Patent FR-1910-411225 (Inventors: Felice Giuseppe Giambattista Carle Luigi GIORDANO, Supplementary to patent: IT-1909-11-15, Filing date: 1910-01-03)
- Patent US-1910-983192 (English title: Aeroplane, Inventors: Samuel S. Yarrington, Filing date: 1910-01-14)
- Patent US-1913-1065263 (English title: Aeroplane steering and stabilizing mechanism, Inventors: Gustav Mees, Filing date: 1910-01-18)
- Patent US-1910-994897 (English title: Aerodrome, Inventors: David A. Albright, Filing date: 1910-01-22)
- Patent FR-1910-412464 (English title: Helicopter with differential propellers, Inventors: Raymod Talmié • Achille Derazey, Filing date: 1910-01-29)
- Patent FR-1910-412059 (English title: Aeroplane, actually hybrid featuring adjustable propellers which aid in ascension as well as forward propulsion, Inventors: Wilhelm Kress, Supplementary to patent: Patent AT-1909-40038, Filing date: 1910-01-31)
- Patent HU-1910-53739 (English title: Equipment for adjusting aircraft propellers, Inventors: Wilhelm Kress, Supplementary to patent: Patent AT-1909-40038, Filing date: 1910-01-31)
- Patent US-1910-996741 (English title: Aerial vessel, Inventors: Wesley Wait, Filing date: 1910-02-21)
- Patent FR-1910-399206.12322 (English title: Maritime and aerial lift-propeller, Inventors: Pierre-Pie Cazaux, Supplementary to patent: Patent FR-1908-399206, Filing date: 1910-03-16)
- Patent FR-1910-418866 (English title: Aerial vessel with ultra-rapid flapping and cyclonal effect by the combined use of the systems of the automatic detonator and the cyclone sprayer, Inventors: Marius Chantron, Supplementary to patent: Patent FR-1908-394418 • Patent FR-1908-394418.10449 • Patent FR-1909-394418.11953, Filing date: 1910-05-02)
- Patent US-1910-999560 (English title: Flying-machine, Inventors: Armin Helfer, Filing date: 1910-05-06)
- Patent US-1910-993108 (English title: Airship, Inventors: Thomas Rhoades, Filing date: 1910-05-07)
- Patent DK-1911-14850 (English title: Flying machine, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556, Filing date: 1910-05-11)
- Patent FR-1910-415884 (English title: Aircraft, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556, Filing date: 1910-05-12)
- Patent HU-1910-53730 (English title: Aircraft, actually helicopter, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556, Filing date: 1910-05-15)
- Patent CH-1910-52815 (English title: Aircraft, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556, Filing date: 1910-05-20)
- Patent US-1912-1034429 (English title: Flying-machine, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556, Filing date: 1910-05-26)
- Patent NZ-1910-27803 (English title: Flying Machines, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556, Filing date: 1910-05-31)
- Patent GB-1911-13607 (English title: Improvements in flying machines, Inventors: William Radford, Filing date: 1910-06-04)
- Patent FR-1910-417989 (English title: Concentric biplane with contrary movements, actually a helicopter, featuring two counter-rotating blades, or sets of blades, Inventors: Édouard-Jean Bigourdan, Filing date: 1910-06-25)
- Patent FR-1910-429307 (English title: Improvements in airplanes, actually a helicopter-hybrid, Inventors: Joseph Boisseau, Filing date: 1910-07-12)
- Patent HU-1910-56402 (English title: Innovations on flying machines, Inventors: Ignác Lampl, Filing date: 1910-07-20)
- Patent GB-1910-17653 (English title: Improvements in the methods of controlling the flight of helicopters, Inventors: Michael Holroyd Smith, Filing date: 1910-07-25)
- Patent HU-1910-52027 (English title: Rain umbrella with propeller, Inventors: Pál Kazvinczky, Filing date: 1910-07-27)
- Patent HU-1910-52780 (English title: Aircraft, actually a helicopter, Inventors: Ferenc Gidró, Filing date: 1910-08-19)
- Patent US-1910-1171075 (English title: Flying-Machine, Inventors: Edwin Taylor, Filing date: 1910-08-22)
- Patent GB-1910-20786 (English title: Aerial Vessels, Inventors: William Everett Sylvester Coyne, Filing date: 1910-09-06)
- Patent FR-1911-420180 (English title: Air ships, Inventors: William Everett Sylvester Coyne, Filing date: 1910-09-09)
- Patent US-1911-996366 (English title: Aerial-navigation machine, Inventors: Walter W. Roberts, Filing date: 1910-09-16)
- Patent DE-1910-247715 (English title: Propeller blade for helicopters, arranged to function as airfoils when the propulsion system is oriented toward horizontal movement, Inventors: Otto Schmidt, Filing date: 1910-09-25)
- Patent US-1910-984258 (English title: Flying-machine, Inventors: Adelard J. Beauregard, Filing date: 1910-09-30)
- Patent HU-1910-55408 (English title: Flying machine, helicopter with two longitudinally separated lift propellers, Inventors: Ágost Ernő Müller, Filing date: 1910-10-31)
- Patent US-1912-1028891 (English title: Airship, Inventors: William David Le Fevre, Filing date: 1910-11-02)
- Patent FR-1909-420315.14594 (English title: Aviation, Inventors: Jean-Jacques-Élie Farcot, Supplementary to patent: Patent FR-1909-420315, Filing date: 1910-11-03)
- Patent BE-1910-230691 (English title: Winged helicopter hybrid, Inventors: P. Ducastel, Filing date: 1910-11-24)
- Patent US-1911-990015 (English title: Aeroplane, Inventors: Josef Skorupa, Filing date: 1910-12-01)
- Patent FR-1910-417989.13504 (English title: Concentric biplane with contrary movements, actually a helicopter, featuring two counter-rotating blades, or sets of blades, Inventors: Édouard-Jean Bigourdan, Supplementary to patent: Patent FR-1910-417989, Filing date: 1910-12-03)
- Patent GB-1910-28212 (English title: Improvements in aerial machines, Inventors: John Peter Glover, Filing date: 1910-12-05)
- Patent US-1911-995750 (English title: Airship, Inventors: Lincoln Winters • Samuel Hofsetter, Filing date: 1910-12-30)
- Patent FR-1910-424499 (English title: Propulsion-lift propeller for airplanes, Inventors: Émile Lallouette, Filing date: 1910-12-31)
- Patent CA-1910-130926 (English title: Aerial Vessel, Inventors: William Everett Sylvester Coyne, Filing date: 1911-02-07)
- Patent US-1911-996153 (English title: Aerodrome, Inventors: Guy SNOW, Supplementary to patent: Car, Filing date: 1969-12-31)
- Patent US-1911-992726 (English title: Flying-machine, Inventors: Edwin Lyman MADDEN, Filing date: 1969-12-31)
- Patent US-1911-994417 (English title: Aerodrome, Inventors: Nathaniel L MAYHEW, Supplementary to patent: Car, Filing date: 1969-12-31)
- Patent US-1911-992874 (English title: Flying-machine, Inventors: Frank W JATUNN, Supplementary to patent: Landing, Filing date: 1969-12-31)
- Patent US-1911-994966 (English title: Flying-machine, Inventors: James W WOODINGTON, Supplementary to patent: 1911-06-13, Filing date: 1969-12-31)
- Patent US-1912-1013523 (English title: Airship, Inventors: Frank G. Vohs, Filing date: 1911-01-03)
- Patent FR-1911-426433 (English title: Helicopter, Inventors: Elisha Depoy Appley, Filing date: 1911-01-23)
- Patent GB-1911-5162 (English title: Flying Machines, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1909-12556, Filing date: 1911-03-01)
- Patent FR-1912-439296 (English title: Helicopter propeller, Inventors: Constant Crouzat, Filing date: 1911-04-03)
- Patent US-1912-1015656 (English title: Flying machine, Inventors: Albert Valentine, Filing date: 1911-04-13)
- Patent FR-1911-440593 (English title: Process for ensuring the lift and propulsion of bodies immersed in a fluid, Inventors: Alphonse Papin • Didier Rouilly, Filing date: 1911-05-06)
- Patent FR-1911-440594 (English title: Helicopter, Inventors: Alphonse Papin • Didier Rouilly, Filing date: 1911-05-06)
- Patent FR-1911-429645 (English title: Improvements to aeroplanes, actually an airplane-helicopter hybrid, Inventors: Alvaro Da Cunha, Filing date: 1911-05-12)
- Patent FR-1911-417989.14395 (English title: Concentric biplane with contrary movements, actually a helicopter, featuring two counter-rotating blades, or sets of blades, Inventors: Édouard-Jean Bigourdan, Supplementary to patent: Patent FR-1910-417989, Filing date: 1911-06-07)
- Patent US-1911-1009048 (English title: Aerodrome, Inventors: Peter Pitcairn Carmichael, Filing date: 1911-06-07)
- Patent GB-1911-14926 (English title: Improvements relating to Helicopter Flying-machines, Inventors: Édouard-Jean Bigourdan, Supplementary to patent: Patent FR-1910-417989, Filing date: 1911-06-26)
- Patent US-1911-1049927 (English title: Flying-machine, Inventors: Edward L. Sieg, Filing date: 1911-08-16)
- Patent FR-1911-434401 (English title: Improvements in airplanes, actually improvements applicable to the helicopter-hybrid described in an earlier patent, Inventors: Joseph Boisseau, Supplementary to patent: Patent FR-1910-429307, Filing date: 1911-08-30)
- Patent US-1911-1052334 (English title: Flying-machine, Inventors: Albert L. Gettys • Alton E. Hiteshew, Filing date: 1911-09-23)
- Patent GB-1911-22789 (English title: Helicopter, Inventors: Albert Valentine, Filing date: 1911-10-16)
- Patent FR-1911-436471 (English title: Propulsion helicopter, Inventors: Armand Barre, Supplementary to patent: 1910-11-29, Filing date: 1911-11-16)
- Patent FR-1911-448295 (English title: Helicopter aeroplane, Inventors: Édouard Louis Huber, Filing date: 1911-11-21)
- Patent HU-1911-57780 (English title: Lifting screw flying machine structure air-screw?, Inventors: Sándor Helyes, Filing date: 1911-12-05)
- Patent US-1913-1052986 (English title: Flying-machine, Inventors: Joseph L. TUCKER, Supplementary to patent: 1, Filing date: 1969-12-31)
- Patent CH-1912-59557 (English title: Superimposed propellers rotating in opposite directions, avoiding uneven strain, suitable (directly) for lift as well as propulsion, Inventors: Karl Pollacsek)
- Patent FR-1912-450466 (English title: Helicopter, actually constituted of multiple airplanes, Inventors: Armand-Jean-Auguste Deperdussin, Filing date: 1912-01-20)
- Patent FR-1912-439343 (English title: Improvements to hydro-aeroplanes and similar devices, VTOL as well, helicopter, hybrid, Inventors: Gustav Mees, Filing date: 1912-01-24)
- Patent AT-1912-67896 (English title: Flying machine with folding fabric-covered sail-wheels, Inventors: Kurt Schultze, Filing date: 1912-01-25)
- Patent FR-1912-424499.15387 (English title: Propulsion-lift propeller for airplanes, Inventors: Émile Lallouette, Supplementary to patent: Patent FR-1910-424499, Filing date: 1912-01-29)
- Patent HU-1912-61202 (English title: Vertically ascending aircraft, Inventors: Kurt Schultze, Filing date: 1912-01-29)
- Patent GB-1912-3110 (English title: Improvements in vertically ascending flying machines, Inventors: Kurt Schultze, Filing date: 1912-02-07)
- Patent FR-1912-439989 (English title: Improvements to the means for mounting propellers, and more specifically ascending propellers with variable pitch, on aircraft, Inventors: Gustav Mees, Supplementary to patent: Patent DE-1911-04-03 Gustav Mees • Patent FR-1910-410140.12658 • Patent FR-1910-410140.13073, Filing date: 1912-02-10)
- Patent US-1912-1034430 (English title: Flying-machine, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent GB-1911-5162 • Patent US-1912-1034429 • Patent GB-1909-12556, Filing date: 1912-02-24)
- Patent AU-1912-4103 (English title: Flying machines, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent AU-1909-18014 • Patent GB-1911-5162, Filing date: 1912-02-27)
- Patent FR-1912-415884.15536 (English title: Aircraft, Inventors: Thomas Augustus Dring, Supplementary to patent: Patent FR-1910-415884 • Patent GB-1911-5162 • Patent GB-1909-12556, Filing date: 1912-02-29)
- Patent GB-1912-5459 (English title: Improvements in or relating to Aerial Machines, Inventors: Jacob Ellehammer • Niels Waltersen Aasen, Filing date: 1912-03-04)
- Patent FR-1912-441314 (English title: Improvements to propellers, and especially to overhead propellers, with changeable tilt blades, Inventors: Gustav Mees, Supplementary to patent: Patent DE-1911-12-15 Gustav Mees, Filing date: 1912-03-13)
- Patent AU-1912-4350 (English title: Vertically ascending flying machines, Inventors: Kurt Schultze, Filing date: 1912-03-19)
- Patent US-1912-1046219 (English title: Flying-machine, Inventors: William Phillips, Filing date: 1912-04-18)
- Patent US-1912-1133660 (English title: Helicopter, Inventors: Alphonse Papin • Didier Rouilly, Supplementary to patent: Patent FR-1911-440594, Filing date: 1912-04-29)
- Patent GB-1912-10633 (English title: Improvements in Helicopters, Inventors: Alphonse Papin • Didier Rouilly, Supplementary to patent: Patent FR-1911-440594, Filing date: 1912-05-04)
- Patent AT-1912-63082 (English title: Screw flyer, Inventors: Alphonse Papin • Didier Rouilly, Supplementary to patent: Patent FR-1911-440594, Filing date: 1912-05-04)
- Patent FR-1912-429645.15915 (English title: Improvements in airplanes, actually an airplane-helicopter hybrid, Inventors: Alvaro Da Cunha, Supplementary to patent: Patent FR-1911-429645, Filing date: 1912-05-13)
- Patent US-1913-1050921 (English title: Airship, Inventors: James Darche, Filing date: 1912-05-22)
- Patent FR-1912-444505 (English title: helicopter parachute with automatic stability and light motor system of variable power, Inventors: Ernest Bertin, Filing date: 1912-05-25)
- Patent FR-1912-444533 (English title: helicopter parachute with automatic stability and human propulsion, Inventors: Ernest Bertin, Filing date: 1912-05-25)
- Patent GB-1912-13180 (English title: Improvements in Aerial Machines, Inventors: Peter Pitcairn Carmichael, Supplementary to patent: Patent US-1911-1009048, Filing date: 1912-06-04)
- Patent GB-1912-13882 (English title: Improvements relating to Helicopter Flying Machines, Inventors: Édouard Jean Bigourdan, Supplementary to patent: Patent GB-1911-14926, Filing date: 1912-06-13)
- Patent US-1912-1061870 (English title: Flying-machine, Inventors: Vincente Lenoard Rodriguez, Filing date: 1912-06-22)
- Patent DE-1912-267069 (English title: Sailing wheel for aircraft with disks rotating at an angle to one another and panels of fabric attached to them, Inventors: Kurt Schultze, Filing date: 1912-07-18)
- Patent FR-1912-446544 (English title: Aeroplane helicoplane, Inventors: Pascal Frère, Supplementary to patent: Patent BE-1912-04-02, Filing date: 1912-07-26)
- Patent GB-1912-17933 (English title: Pyramidal helicopter, Inventors: Travers Glynn Ivon Ayers, Filing date: 1912-08-02)
- Patent FR-1913-459262 (English title: Flying machine that can rise vertically, Inventors: Alexei Schidkoff, Filing date: 1912-08-31)
- Patent FR-1912-449486 (English title: Aerial vehicle, Inventors: Édouard-Jean Bigourdan • Alexis Beurrier, Filing date: 1912-10-16)
- Patent BE-1912-250406 (English title: Autoglider “Aéra” with propellers of ascension, Inventors: Alfred E. Wunderlich, Filing date: 1912-10-28)
- Patent BE-1912-250457 (English title: Ascension propeller “Aéra”, Inventors: Alfred E. Wunderlich, Filing date: 1912-10-29)
- Patent US-1914-1091315 (English title: Airship, Inventors: David F Felten, Filing date: 1912-11-22)
- Patent FR-1912-450466.18100 (English title: Helicopter, or more properly a gyroscope preventing the nacelle from rotating with the propellers, Inventors: Armand-Jean-Auguste Deperdussin, Supplementary to patent: Patent FR-1912-450466, Filing date: 1912-11-28)
- Patent BE-1913-252450 (English title: Crazy wings(or possibly propeller blades) for airplane, Inventors: A. Sainte-Croix, Filing date: 1913-01-02)
- Patent FR-1914-464462 (English title: Radial tail for ascension propellers, Inventors: Camille Lacoste, Filing date: 1913-01-13)
- Patent FR-1914-464461 (English title: Aerial lift blades with shell, Inventors: Camille Lacoste, Filing date: 1913-01-13)
- Patent BE-1913-250457.252822 (English title: Ascension propeller “Aéra”, Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent BE-1912-250457, Filing date: 1913-01-16)
- Patent BE-1913-250406.252841 (English title: Autoglider “Aéra” with propellers of ascension, Inventors: Alfred E. Wunderlich, Supplementary to patent: Patent BE-1912-250406, Filing date: 1913-01-17)
- Patent FR-1914-464794 (English title: Single-propeller helicopter, Inventors: Camille Lacoste, Supplementary to patent: Patent FR-1914-464461, Filing date: 1913-01-21)
- Patent US-1913-1230443 (English title: Aircraft, Inventors: John P. Tarbox, Filing date: 1913-07-02)
- Patent GB-1913-16621 (English title: Superimposed propellers rotating in opposite directions, avoiding uneven strain, suitable (directly) for lift as well as propulsion, Inventors: Karl Pollacsek, Supplementary to patent: Patent CH-1912-59557, Filing date: 1913-07-19)
- Patent FR-1913-460847 (English title: Air navigation equipment on pyramidal helicopter, Inventors: Travers Glynn Ivon Ayers, Supplementary to patent: Patent GB-1912-17933, Filing date: 1913-07-29)
- Patent US-1915-1160473 (English title: Flying-machine, Inventors: Edward WARNER, Filing date: 1969-12-31)
- Patent BE-1907-201848 (English title: Aviator or flying machine, Inventors: J.-L. Senden, Filing date: 1907-08-01)
- Patent US-1914-1132049 (English title: Flying-machine, Inventors: Charles W. Waller, Filing date: 1914-03-05)
- Patent FR-1915-475610 (English title: Helicopter with a single lift blade, Filing date: 1914-03-07)
- Patent CH-1914-95181 (English title: Helicopter with one single lift propeller, Inventors: Société Anonyme des Établissements Nieuport, Filing date: 1914-03-09)
- Patent BE-1914-266770 (English title: Helicoplane, Inventors: Edmond-Louis Douhéret, Filing date: 1914-04-20)
- Patent BE-1914-267316 (English title: New aviation machine, actually an airplane-helicopter hybrid, if not an outright helicopter, Inventors: J.-C.-A. Storms • L.-J.-U. Storms, Supplementary to patent: Patent BE-1914-257316, Filing date: 1914-04-22)
- Patent BE-1914-267316.269391 (English title: New aviation machine, actually an airplane-helicopter hybrid, if not an outright helicopter, Inventors: J.-C.-A. Storms • L.-J.-U. Storms, Supplementary to patent: Patent BE-1914-267316, Filing date: 1914-07-15)
- Patent GB-1914-19559 (English title: Flying Machines, Inventors: John Logan Lemons, Filing date: 1914-09-08)
- Patent GB-1914-12574 (English title: Improvements in and relating to Aerial Machines, actually a range of applied observations aerodynamically pertinent to blades or wings, Inventors: Isaac Bell, Filing date: 1914-11-11)
- Patent GB-1914-4543 (English title: Improvements in and relating to Aerial Machines and Aerial Driven Watercraft, actually an elaborately pivoting propeller, Inventors: Isaac Bell, Filing date: 1914-11-11)
- Patent HU-1914-68447 (English title: Helicoplane, Inventors: Kálmán Fekete, Filing date: 1969-12-31)
- Patent FR-1915-477552 (English title: Improvement to aircraft of the helicopter type, Inventors: Maxime PHILIPPON, Filing date: 1915-02-06)
- Patent US-1916-1186650 (English title: Flying-machine, Inventors: Joseph T. Crow, Filing date: 1915-05-04)
- Patent FR-1915-523791 (English title: Improvements to helicopters, Inventors: Marius Latour, Filing date: 1915-05-12)
- Patent FR-1915-502520 (English title: Improvements in Flying Machines with Revolving Wings, Inventors: Alexis Beurrier • Edmond Bigourdan • Louis Lacoin, Filing date: 1915-11-06)
- Patent FR-1916-481332 (English title: Helicopter-Plane (?), Inventors: Lyoubomir Boïovitch, Filing date: 1915-11-29)
- Patent BE-1916-275531 (English title: Airship which is heavier-than-air, HELICOPTER, Inventors: C.-L. Carrels, Filing date: 1916-03-13)
- Patent GB-1916-281735 (English title: Improvements relating to aerial navigation, Inventors: Louis Brennan, Filing date: 1916-05-19)
- Patent FR-1916-521764 (English title: Improvements to aircraft which are heavier-than-air, actually an airplane-helicopter hybrid, Filing date: 1916-06-17)
- Patent US-1916-1237318 (English title: Airship, Inventors: John Flink, Filing date: 1916-10-10)
- Patent FR-1916-502520.22245 (English title: Rotary wing aircraft, Inventors: Alexis Beurrier • Edmond Bigourdan • Louis Lacoin, Supplementary to patent: Patent FR-1915-502520, Filing date: 1916-11-02)
- Patent US-1917-1350982 (English title: Flying-machine with revolving wings, Inventors: Alexis Beurrier • Édouard-Jean Bigourdan • Louis Lacoin, Filing date: 1917-03-24)
- Patent CA-1917-177665 (English title: Dirigible airship, Inventors: Eddy L. Eddy, Filing date: 1917-04-12)
- Patent AT-1917-79539 (English title: screw captive aircraft, Inventors: Oszkár Asbóth, Filing date: 1917-04-30)
- Patent HU-1917-76184 (English title: Aircraft propeller or screw plane, Inventors: Oszkár Asbóth, Supplementary to patent: Patent AT-1917-79539, Filing date: 1917-06-04)
- Patent US-1921-1366016 (English title: Aeroplane-propeller, Inventors: Arthur A. Mosher, Filing date: 1917-08-30)
- Patent US-1918-1264712 (English title: Lifting propellers, Inventors: Howard P Tweed, Filing date: 1917-09-29)
- Patent FR-1919-494660 (English title: Flying machine (helicopter), Inventors: Theophile-Ascague Leleu, Filing date: 1917-12-11)
- Patent US-1918-1435190 (English title: Direct-ascent flying machine, Inventors: Pieter Barteld Van Leggelo, Filing date: 1918-01-05)
- Patent US-1918-1285479 (Inventors: Andreas Marius Van Bezooyen, Filing date: 1918-03-29)
- Patent GB-1918-122164 (English title: Improvements in and relating to Air-craft of the Helicopter Type, Inventors: Pieter Barteld Van Leggelo, Supplementary to patent: Patent US-1918-1435190, Filing date: 1918-04-03)
- Patent US-1918-1287076 (English title: Flying machine, Inventors: Samuel Moses, Filing date: 1918-05-20)
- Patent GB-1918-127418 (English title: Improvements in Aerial Lifting Devices, Inventors: Cornelis Hendrik van Asperen, Supplementary to patent: Patent US-1918-1374256, Filing date: 1918-06-10)
- Patent GB-1918-128724 (English title: Improvements to aeroplanes, Inventors: Louis Raymond Accornero • Adolphe Gaydon, Filing date: 1918-06-24)
- Patent US-1923-1472148 (English title: Helicopter, Inventors: Emile Berliner, Filing date: 1918-10-04)
- Patent US-1920-1454944 (English title: Helicopter propeller system, Inventors: Raúl Pateras Pescara, Supplementary to patent: Patent ES-1919-07-03-Pescara, Filing date: 1920-07-15)
- Patent BE-1926-338559 (English title: Helicopter with two lift propellers, Inventors: Nicolas Florine, Filing date: 1926-03-03)
- Patent US-1928-1655114 (English title: Apparatus for Aerial Transportation, Inventors: Nikola Tesla, Supplementary to patent: Patent US-1928-1655113, Filing date: 1927-10-04)
- Patent US-1929-1775861 (English title: Flying machine, Inventors: George Lehberger, Filing date: 1929-05-28)