Autogyro aircraft
CA 2132839 C · Owner: Groen, David Lynn · Inventors: Groen, Henry Jay; Groen, David Lynn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An autogyro (10) has a teetering semi-rigid rotary wing (28) with rigid rotor blades (30a, 30b). The blade pitch of the rotor blades (30a, 30b) is fully adjustable in flight and varies along the blade length. A prerotator (100) rotates the rotor blades (30a 30b) up to takeoff speed at minimum drag no lift and optimum engine , efficiency. Engine power is disconnected from the rotor blades (30a, 30b) and their angle of attack is changed for optimum lift. Rotor blade pitch is adjusted during vertical landing. In flight, rotor blade angle of attack is varied to adjust autorotation lift and , drag at any flight airspeed. On the ground the rotary, wing (28) is braked to prevent rotation. The …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 25, 1993 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.