Process for the resolution of pyrano3,4-bindole- 1-acetic acids
CA 1190230 A · Owner: Humber, Leslie G. · Inventors: Humber, Leslie G.; Demerson, Christopher A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mixtures of racemic (?)pyrano3,4-bindole-1-acetic acids are resolved with (-)-borneol to obtain the substantially pure (+) and (-)-enantiomers. The resolution involves the formation of a mixture of the diastereoisomeric pyrano3,4bindole-acetic acid, (-)-borneol esters separation of the diastereoisomeric, esters and hydrolysis of the latter esters.
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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 July 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 2002.
- 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.