Cyclic anthranilic acid derivatives and process for their preparation
CA 1317294 C · Owner: Kyorin Pharmaceutical Co. Ltd. · Inventors: Awano, Katsuya; Kojima, Eisuke; Fujimori, Shizuyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Title of the invention :, Novel cyclic anthranilic acid derivatives and process for their preparation, Abstract of the invention : Cyclic anthranilic acid derivatives of the following formula, wherein R1, R2 and R3 each independently indicate a hydrogen atom a halogen, atom, lower alkyl group having 1 to 3 carbon atoms lower alkoxy, group having 1 to 3 carbon atoms amino group, nitro group, hydroxy group sulfonamide group, trifluoromethyl group cyano, group, carboxyl group, carbamoyl group acetyl group, benzoyl-, methyl group which may be substituted methylthio group, phenyl-, ethynyl group which may be substituted ethynyl group which may, be substituted alkanoylamino group having 1 to 3 …
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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 4, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 4, 2010.
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Timeline
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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.