US Patent Classification 244/24 was for Lighter-than-air aircraft: Miscellaneous aircraft which ordinarily have a total weight less than or equal to that of the volume of air which they displace and are thus sustained by their buoyancy in air. Under 244/24:
- USPC 244/25: Airships with sustaining wings: Propelled aeronautical machines sustained by their buoyancy relative to the air, having also provision for sustentation by aerodynamic action on airfoils in fixed relation to the machines. In this subclass the machines are primarily lighter-than-air craft with the fixed sustaining airfoils providing additional sustentation. Machines which are primarily airplanes but have provision for carrying some lighter-than-air gas to diminish their weight are found in USPC 244/5.
- USPC 244/26: Airship and helicopter sustained: USPC 244/24 This subclass is indented under subclass 24. Propelled aeronautical machines sustained by their buoyancy relative to the air, having also provision for sustentation or vertical lift by means of screw propellers arranged to develop a substantial component of thrust in a vertical direction.
- For helicopters with sustaining wings too, see USPC 244/6. For helicopters without airplane wings, see USPC 244/17.11+.
- USPC 244/27 Airship and paddle wheel sustained: USPC 244/24 Propelled aeronautical machines sustained by their buoyancy relative to air, and with sustentation or vertical lift by the downward thrust from rotating paddle wheels. The paddle wheels may also provide forward propulsion. For paddle wheels on machines having also sustaining wings, see USPC 244/9. For machines sustained by paddle wheels alone, see USPC 244/19 and USPC 244/20.
- USPC 244/28 Airship and beating wing sustained: under USPC 244/24: Propelled aeronautical machines sustained by their buoyancy relative to the air, having also provision for sustentation or vertical lift by the downward thrust developed by flapping or reciprocating blades attached to the machines. These blades may also provide a part or all of the forward propulsion. For machines having fixed sustaining airfoils and beating wings, see USPC 244/11. For machines sustained by beating wings see USPC 244/22. For beating wing construction see USPC 244/72.
- USPC 244/29: Airship and fluid sustained: (under USPC 244/24) Propelled aeronautical machines sustained by their buoyancy relative to the air, having also provision for sustentation by the reaction to downward movement of restricted masses or jets of air or other fluid. The forward propulsion of the machine may also be derived from movement of the same or similar masses or jets of air or other fluid. For machines having fixed sustaining airfoils as well as means for fluid sustentation, see this class, subclasses 12.1+. For fluid-propelled airplanes see USPC 244/15 For machines sustained solely by fluid reaction, see USPC 244/23. For fluid propulsion and sustentation devices per se, see USPC 244/73 and USPC 244/74.
- USPC 244/30 Airships: Propelled aeronautical machines sustained by their buoyancy relative to the air. Relatedly, see: USPC 244/61, for power plants for airships using some gas used in the sustentation or operation or as fuel of the aircraft; USPC 244/94, for ballast storage and release; USPC 244/95, for ballast making; USPC 244/96+, for control devices and their arrangement, particularly adapted for use on airships. USPC 244/125, USPC 244/126, USPC 244/127, and USPC 244/128 for the construction of airships.
- USPC 244/31 Balloons. Aircraft sustained by their buoyancy relative to the air, having no provision for propulsion. For a coated or impregnated fabric see USPC 442/59+, Fabric - woven, knitted, or nonwoven textile or cloth
- USPC 244/32 Balloons with parachutes: Aircraft normally sustained by their buoyancy relative to the air, having also provision for retarding their fall upon failure of their buoyancy, by means of parachutes attached to or formed from some part of their structure. This subclass includes those aircraft having propulsion means disclosed, but in which the invention is the combination between the gas bag and the parachute, or the conversion from one to the other. See or search USPC 244/139 for combinations of balloon, parachute and heavier-than-air craft for lowering the latter in an emergency.
- USPC 244/33 Captive: (parent is 244/31) Aircraft sustained by their buoyancy relative to the air, restrained from free flight by ropes or cables connecting them to some fixed or movable anchoring means on the ground or water. Relatedly, see: USPC 40 Card, Picture, or Sign Exhibiting, subclass USPC 40/214 for similar aircraft provided with signs or other advertising.
Patents in category USPC 244/24
- Patent US-1866-57996 (English title: Marine balloon, Inventors: Chester W. Sykes)
- Patent US-1887-363037 (English title: Means & Apparatus for propelling and guiding balloons, Inventors: Charles Richard Édouard Wulff, Supplementary to patent: Patent FR-1886-175662, Filing date: 1886-05-24)
- Patent US-1893-505414 (English title: Balloon for observing distant objects, Inventors: Charles Abbott Smith, Filing date: 1893-05-11)
- Patent US-1912-1023404 (English title: Combined boat and airship, Inventors: Joseph Wymore, Filing date: 1911-06-06)
|Enclosing categories||USPC 244|
|Subcategories||USPC 244/25, USPC 244/26, USPC 244/27, USPC 244/28, USPC 244/29, USPC 244/30, USPC 244/31|
|Keywords||LTA, CPC B64B1/00|