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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
Keywords Propeller, USPC 244/17.11, CPC B64C27/00, CPC B64C29/00, CPC G05D1/0858
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This wiki has 278 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, USPC 244, USPC 244/17.11, USPC 244/17.17, USPC 244/26, USPC 244/6, USPC 244/7

Patents in category Helicopter