Expired Canadian patentCanada
5-substituted 1,2,4-oxadiazole derivatives and preparation thereof
CA 1293249 C · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Yamamoto, Michihiro
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This disclosure describes novel 5substituted 1,2,4-oxadiazoles useful as pharmaceuticals such as anti-inflammatory and analgesic agents.
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 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 17, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 1, 1983
GrantedDecember 17, 1991
Term endedDecember 17, 2008
Patent numberCA 1293249 C
Classification (IPC)C07D271/06 +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.