Expired Canadian patentCanada
Preparation of optically active cyclopentyl derivatives
CA 1093082 A · Owner: Pfizer Inc. · Inventors: Bindra, Jasjit S.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel optically active cyclopentyl derivatives of heptenoic acids useful as intermediates in the preparation of prostaglandin analogs and processes for the preparation thereof.
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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 January 6, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 6, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 13, 1980
GrantedJanuary 6, 1981
Term endedJanuary 6, 1998
Patent numberCA 1093082 A
Classification (IPC)C07D309/12 +2 more
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.