1-phenylpyrazole compounds and medicinal application thereof
CA 2269721 C · Owner: Ishibuchi, Seigo · Inventors: Naka, Yoichi; Inoue, Hiroyoshi; Morimoto, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1-Phenylpyrazole compounds represented by general formula (1) such as 5-amino- 1-(3-cyano-4-isobutoxyphenyl)pyrazole-4-carboxylic acid optical isomers , thereof, and medicinally acceptable salts thereof. These compounds have a xanthine oxidase inhibitory effect and are useful as remedies for diseases such as hyperuricemia and gout.
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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
- Filed October 22, 1997 and granted April 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.