1-hydroxy-5-oxo-5h-pyrido¬3,2-a phenoxazine -3-carboxylic acid esters
CA 1311477 C · Owner: Senju Pharmaceutical Co. Ltd. · Inventors: Inoue, Jun; Terayama, Hideo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1-HYDROXY-5-OXO-5H-PYRIDO3,2-aPHENOXAZINE-3-CARBOXYLIC ACID ESTERS, Abstract:, The present invention is directed to compounds represented by the general formula, wherein R is an alkyl group having 1 - 10 carbon atoms. Since they have excellent affinities for tissues with particular high corneal permeability and show anticataract activity at low concentrations, the compounds are of value as prophylactic and therapeutic agents for cataract treatment.
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 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 2009.
- 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.