Expired Canadian patentCanada
Herbicidal sulfonamides
CA 1203534 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Petersen, Wallace 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
Hydroxymethylbenzenesulfonamide derivatives have utility as agricultural chemicals and in particular as herbicides.
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 April 22, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 22, 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.
FiledJuly 9, 1981
GrantedApril 22, 1986
Term endedApril 22, 2003
Patent numberCA 1203534 A
Classification (IPC)C07D239/28 +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.