Expired Canadian patentCanada
Audio-frequency signal amplifier system
CA 778933 A · Owner: Morrison, William B. · Inventors: Morrison, William B.
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 February 20, 1968. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 20, 1985.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 22, 1962
GrantedFebruary 20, 1968
Term endedFebruary 20, 1985
Patent numberCA 778933 A
Classification (IPC)H03F1/00 +1 more
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.