Optically active esters of 7-substituted 3,5-difunctionalized 6-heptenoic acids
CA 2050266 A1 · Owner: Reddy, Guntoori B. · Inventors: Hiyama, Tamejiro; Hanamoto, Takeshi; Minami, Tatsuya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides optically active esters of 7substituted 3,5-difunctionalized 6-heptenoic acids represented by the following formula:, wherein, R is a substituted or unsubstituted aromatic group a, substituted or unsubstituted heteroaromatic group or a substituted vinyl group;, Ar is a condensed aromatic group; X1 and Y1 are not the same and each is a hydrogen atom or a hydroxyl group, or may be combined to represent an oxygen atom which forms a carbonyl group together with the-carbon atom to which X1 and Y1 are attached; and X2 and Y2 are not the same and each is a hydrogen atom or a hydroxyl group, or may be combined to represent an oxygen atom which forms a carbonyl group …
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 August 29, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 2013.
- 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.