Regeneration of 6-fluoro-4-chromanone from by- products in the synthesis of sorbinil
CA 1181754 A · Owner: Pfizer Limited · Inventors: Massett, Stephen S.; Hammen, Philip D.; Cue, Berkeley W. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, 6-Floro-4-chromanone, a sorbinil intermediate is regenerated from enantiomeric and mixtures of enantiomeric and racemic compounds obtained as major by-products in the synthesis of sorbinil. the regenerated intermediate is useful in the synthesis of additional sorbinil.
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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 29, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 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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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.