Agent for treating cataract and method for its preparation
CA 2135302 A1 · Owner: Sogo, Shunji · Inventors: Abe, Yoshimasa; Azuma, Mitsuyoshi; Sogo, Shunji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An agent comprising (+)-(2S,3S)-3(S)-3-methyl-1-(3methylbutylcarbamoyl)butylcarbamoyl-2-oxiranecarboxylic acid its salt or its ethyl ester, which is useful for the treatment and prevention of cataract, and a method for the preparation thereof in the form of an eye drop comprising adjusting a pH of an aqueous solvent in such a manner that the pH of the final preparation falls in the range of from 3 through 7 before or, after mixing the compound with the aqueous solvent. The above compound has superior effects in the treatment and prevention of cataract. Particularly an agent in the form, of an aqueous solution and having a pH of 3-7 shows superior corneal permeability and is a stable agent …
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
- Filed May 17, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2015.
- 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.