Expired Canadian patentCanada
3-(1h-tetrazol-5-yl)-4(3h)-quinazolinones
CA 1254204 A · Owner: The Dow Chemical Company · Inventors: Peet, Norton P.; Sunder, Shyam
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-(1H-tetrazol-5-yl)-4(3H)-quinazolinones useful as antiallergic agents are described herein. The compounds are prepared by the reaction of an appropriate 2-amino-N- (1H-tetrazol-5-yl)benzamide with an appropriate orthoester.
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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 May 16, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 16, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 14, 1983
GrantedMay 16, 1989
Term endedMay 16, 2006
Patent numberCA 1254204 A
Classification (IPC)C07D403/04 +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.