Expired Canadian patentCanada
Procede d'isolement et de purification de polyepoxydes a partir de leurs solutions dans les hydrocarbures
CA 837723 A · Owner: Institut Francais Du Petrole · Inventors: Jean Gaillard; Claude Fey; Jean-Pierre Wauquier
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 24, 1970. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 1987.
- 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 24, 1970
Term endedMarch 24, 1987
Patent numberCA 837723 A
Classification (IPC)C08G59/00 +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.