Expired Canadian patentCanada
Correction of frequency shift in carrier systems
CA 807237 A · Owner: Western Electric Company, Incorporated · Inventors: Robert L. Haner; Norman L. Major
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
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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 February 25, 1969. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 25, 1986.
- 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—
GrantedFebruary 25, 1969
Term endedFebruary 25, 1986
Patent numberCA 807237 A
Classification (IPC)H04B1/68
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.