Expired Canadian patentCanada
Nitrite gel suppressants for a block copolymer containing a conjugated diene and a monovinyl aromatic
CA 1190690 A · Owner: Phillips Petroleum Company · Inventors: Short, James N.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A metal nitrite or organic nitrite is admixed with a monovinylsubstituted aromatic hydrocarbon/conjugated diene copolymer to inhibit gel and fisheye formation in the copolymer.
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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 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 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 26, 1982
GrantedJuly 16, 1985
Term endedJuly 16, 2002
Patent numberCA 1190690 A
Classification (IPC)C08K3/28 +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.