Bearingless main rotor assembly torque tube
CA 2115166 C · Owner: United Technologies Corporation · Inventors: Byrnes, Francis E.; Cullen, I. Lawrence Iii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite torque tube (10) for a bearingless main rotor (BMR) assembly (100) that is optimally fabricated to meet , torsional stiffness fatigue strength, and buckling strength design constraints at minimal unit weight. The composite torque tube (10) includes a strengthened inboard section (12) for mechanically coupling the torque tube (10) in combination with the hub structure (120) of the BMR assembly, a strengthened outboard section (16) for mechanically coupling the torque tube (10) in combination with a corresponding main rotor blade, and an intermediate section (14) that is operative to accomodate the pitch; flapwise and/or edgewise loads acting on the BMR assembly during …
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 August 26, 1992 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 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.