Prostaglandin derivative, salt thereof, and use thereof
CA 2179981 A1 · Owner: Goto, Jun · Inventors: Sato, Fumie; Ono, Naoya; Tanami, Tohru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A prostaglandin derivative represented by general formula (I) a salt thereof, and a medicinal composition containing the same as the active ingredient for lowering the ocular tension. In said formula R1 represents hydrogen, C1-C10 , alkyl or C3-C10 cycloalkyl; R2 represents C3-C10 cycloalkyl optionally substituted by methyl, C1-C3 alkyl substituted by C3-C10 cycloalkyl or C5-C10 , branched alkyl or alkenyl; X represents .alpha.- or ~- chloro; and A represents ethylene, vinylene or ethynylene. This compound is useful as an ocular tension depressant which is free from side effects of e.g. transient , increased tension or is extremely reduced in these side effects.
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 December 27, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 2016.
- 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.