Expired Canadian patentCanada
Preparation of phenyl esters in the presence of boric anhydride
CA 1213602 A · Owner: The Procter & Gamble Company · Inventors: Kong-Chan, Josephine L.Y.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for preparing carboxylic esters of phenols, in which the carboxylic acid and phenol are reacted in the presence of boric anhydride.
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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 November 4, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 4, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 31, 1983
GrantedNovember 4, 1986
Term endedNovember 4, 2003
Patent numberCA 1213602 A
Classification (IPC)C07C69/03 +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.