Expired Canadian patentCanada
First fault annunciator system
CA 983140 A · Owner: Trollope, William G.A. · Inventors: Trollope, William G.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 February 3, 1976. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 3, 1993.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 16, 1973
GrantedFebruary 3, 1976
Term endedFebruary 3, 1993
Patent numberCA 983140 A
Classification (IPC)H04L
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.