Counter-torque device for a helicopter
CA 2810889 C · Owner: Bell Helicopter Textron Inc. · Inventors: Hollimon, Charles; Andrews, James R.; Hurdle, Jim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ducted fan for a helicopter includes a transverse duct and a counter-torque device , supported within the duct. The counter-torque device includes a rotor rotatably mounted , within the duct and a stator fixedly mounted within the duct downstream from the rotor. The , rotor includes a rotor hub having a rotor axis and rotor blades extending , from the hub. The rotor blades have a modulated angular distribution about the rotor axis. The stator includes a , stator hub, and a plurality of stator vanes distributed around the stator hub. The stator vanes , are angularly modulated around the stator hub.
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 15, 2005 and granted October 18, 2016. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 15, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.