Expired Canadian patentCanada
Four-pole limiting spurious signals for type 1 1 telephone transmission systems
CA 1183293 A · Owner: Compagnie Industrielle Des Telecommunications Cit-Alcatel · Inventors: Le Grand, Yves-Marie
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 26, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 26, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 12, 1982
GrantedFebruary 26, 1985
Term endedFebruary 26, 2002
Patent numberCA 1183293 A
Classification (IPC)H04Q7/00 +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.