Expired Canadian patentCanada
Apparatus for indicating when current exceeds a predetermined level and when said level is exceeded for a predetermined period of time
CA 975429 A · Owner: Westinghouse Electric Corporation · Inventors: Wilburn, Garlington C.; Price, Elmo D. (Jr.); Freeze, John A.
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 September 30, 1975. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 30, 1992.
- 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—
GrantedSeptember 30, 1975
Term endedSeptember 30, 1992
Patent numberCA 975429 A
Classification (IPC)H01F27/40 +2 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.