Method of preparation of 3-(3-carboxy-4- hydroxyphenyl)-4,5-dihydro-2-phenylbenzeindole and valuable intermediates ralated thereto
CA 1105936 A · Owner: Hoechst Aktiengesellschaft · Inventors: Effland, Richard C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
HOE 76/F 211, METHOD OF PREPARATION OF 3-(3-CARBOXY-4-HYDROXYPHENYL)- 4,5-DIHYDRO-2-PHENYLBENZeINDOLE AND VALUABLE INTERMEDIATES RELATED THERETO, ABSTRACT OF THE DISCLOSURE: A novel method of preparing the valuable compound 3-(3-carboxy-4-hydroxyphenyl)-4,5-dihydro-2-phenylbenzeindole is described, said compound possessing antiinflammatory and analgetic activity, Also described are novel intermediates useful in the disclosed method.
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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 28, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 28, 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.
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.