Ducted tail rotor for rotary wing aircraft providing torque reaction and yaw attitude control
CA 2113179 C · Owner: Boeing Company (The) · Inventors: Mcardle, Francis H.; Desjardins, Rene A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tail rotor (8) for a rotary wing aircraft is located in a laterally direct duct (9) located at the end of a tail cone (7) extending rearward from the aircraft cabin and at the base of an empennage (5) extending upward from the duct (9). The rotor includes a rotor shaft (78) driveably connected to a power source a rotor hub (10), connected to the rotor shaft (78) a rotating control shaft (64), a , stationary control shaft (118) and an actuator (126) connected to the stationary control shaft (118) for moving-the rotating control shaft (64) axially. The rotor hub (10) includes rotor arms (12) each supporting a pitch shaft (16) for pivotable movement about a pitch axis (B). Each pitch shaft …
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 July 31, 1992 and granted January 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2014.
- 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.