Expired Canadian patentCanada
Process for the preparation of aryloxybenzoic acids containing a sulphonamide group
CA 1215357 A · Owner: Rhone-Poulenc Agrochimie · Inventors: Chene, Alain
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 SULPHONAMIDE GROUP", Process for the preparation of an N-sulphonylaryloxy benzamide by reacting an aryloxybenzoic acid with a sulphonyl isocyanate or isothiocyanate.
Read the whole patent
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 December 16, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 16, 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.
FiledFebruary 15, 1984
GrantedDecember 16, 1986
Term endedDecember 16, 2003
Patent numberCA 1215357 A
Classification (IPC)C07D213/64
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.