Expired Canadian patentCanada
Hydrolysis of aromatic nitriles to carboxylic acids
CA 1067094 A · Owner: Sun Ventures · Inventors: Vanderwerff, William D.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the non-catalytic hydrolysis to equilibrium of an aromatic nitrile, the improvement of carrying out such hydrolysis in the presence of a neutral salt whereby nitrogen impurities of the acid product is reduced. -1-
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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 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 27, 1996.
- 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—
GrantedNovember 27, 1979
Term endedNovember 27, 1996
Patent numberCA 1067094 A
Classification (IPC)C07C51/08
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.