Pitch control mechanism
CA 2073406 C · Owner: Kirkman, Brian George · Inventors: Kirkman, Brian George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pitch control mechanism for a ram air turbine blade (4) comprises a mass (1) fixed to the blade shank (2) in a plane at an angle, to a pitch change axis (5). As the turbine rotates about the rotational axis 7, the mass (1) moves in the direction of arrows (11, 12) according to the speed of rotation varying the pitch of the blade (4). By directly coupling the pitch change mass (1) to the blade (4) the need for complicated linkages is eliminated.
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 9, 1992 and granted December 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 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.