Expired Canadian patentCanada
Metal and acid catalysis in sorbic acid preparation
CA 1183865 A · Owner: Monsanto Company · Inventors: Coleman, James P.; Hallcher, Richard C.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The acid conversion of certain precursors e.g. .gamma.-vinyl-.gamma.-butyrolactone to sorbic acid is improved by presence of cuprous or silver ions along with strong acid.
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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 March 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 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.
FiledDecember 20, 1982
GrantedMarch 12, 1985
Term endedMarch 12, 2002
Patent numberCA 1183865 A
Classification (IPC)C07C57/10 +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.