Cyclopenteneheptenoic acid derivatives and method of preparation thereof
CA 2000179 C · Owner: Babiak, Kevin A. · Inventors: Babiak, Kevin A.; Campbell, Arthur L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a novel cyclopenteneheptenoic acid derivative having the following formula (see formula I), wherein R1 is hydrogen -COCH3, -COCF3, -CO-phenyl, or a hydroxyl protecting group such as tetrahydropyranyl tetrahydrofuranyl, or tri-lower alkylsilyl; wherein R2 is -CH2OR1, -COOH, -COOR, -CHO -CH2-OSi(R12)3, (see formula II), (see formula III) (see formula IV), or (see formula V), wherein R is lower alkyl and each R12 is independently lower alkyl or aryl; and, wherein Y is ethylene cis-vinylene, trans-vinylene, or, acetylene. Also disclosed is a novel process for preparation of the above-defined cyclopenteneheptenoic acid derivative. This process involves coupling of a …
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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
- Filed October 5, 1989 and granted May 2, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 5, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2011.
- 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
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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.