Expired Canadian patentCanada
Blade tracking mechanism for a helicopter
CA 577968 A · Owner: The Kaman Aircraft Corporation · Inventors: John O. Emmerson; Owen F. Polleys
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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
- Granted June 16, 1959. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 1976.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJune 16, 1959
Term endedJune 16, 1976
Patent numberCA 577968 A
Classification (IPC)B64C
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.