Expired Canadian patentCanada
Copolymers containing blowing agents and derived from alkenyl aromatics and vinyl polysiloxanes and process for their manufacture
CA 846237 A · Owner: Farbwerke Hoechst Aktiengesellschaft Vormals Meister Lucius And Bruning · Inventors: Werner Weber; Horst Jastrow
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 July 7, 1970. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 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—
GrantedJuly 7, 1970
Term endedJuly 7, 1987
Patent numberCA 846237 A
Classification (IPC)C08J
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.