Expired Canadian patentCanada
Temperature change responsive means for controlling electric circuits
CA 594875 A · Owner: Speed Development Company Limited · Inventors: William H. Ruffle
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 March 22, 1960. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 22, 1977.
- 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—
GrantedMarch 22, 1960
Term endedMarch 22, 1977
Patent numberCA 594875 A
Classification (IPC)G01K
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.