Expired Canadian patentCanada
3-oxo-1,2,4-triazolo4,3-apyrimidine-6-carboxylic acid esters
CA 1331177 C · Owner: E.R. Squibb & Sons, Inc. · Inventors: Atwal, Karnail
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-OXO-1,2,4-TRIAZOLO4,3-aPYRIMIDINE-6- CARBOXYLIC ACID ESTERS, Abstract, Compounds having the formula and pharmaceutically acceptable salts thereof wherein R4 is aryl are disclosed. These novel compounds are useful, for example, as cardiovascular agents.
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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 August 2, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 2, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 1, 1988
GrantedAugust 2, 1994
Term endedAugust 2, 2011
Patent numberCA 1331177 C
Classification (IPC)C07D487/04 +1 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.