Expired Canadian patentCanada
Process for the preparation of phenoxybenzoic acid derivatives containing a sulphonamide group
CA 1194472 A · Owner: Rhone-Poulenc Agrochimie · Inventors: Heiba, El-Ahmadi I.
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of phenoxybenzoic acid derivatives containing a sulphonamide group by, reacting an acid halide with a sulphonamide in the absence of an acid acceptor and with elimination of hydrohalic acid in the gaseous form.
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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 October 1, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 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.
FiledJuly 26, 1982
GrantedOctober 1, 1985
Term endedOctober 1, 2002
Patent numberCA 1194472 A
Classification (IPC)C07D213/70 +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.