Alkanesulfonamido triphenylethylenes
CA 1064517 A · Owner: Bristol-Myers Squibb Company · Inventors: Kreighbaum, William E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Triphenylethylenes having an N-(dialkylaminoalkyl)alkanesulfonamide substituent in the one of the phenyl rings may be prepared from similarly substituted benzophenones by reaction thereof with a benzyl Grignard reagent followed by dehydration of the resulting triphenylethanol intermediate and if desired chlorination or nitration of the resulting product. The triphenylethylene have estrogenic and post-coital antifertility action and are useful as intermediates for the preparation of other triphenylethylene compounds.
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
- Granted October 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 16, 1996.
- 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.