Hexahydroazepine piperidine and pyrrolidine derivatives
CA 1105929 A · Owner: Wyeth (John) And Brother Limited · Inventors: White, Alan C.; Shepherd, Robin G.; Cavalla, John F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The invention concerns a novel process for preparing hexahydroazepine, piperidine and pyrrolidines of formula (I), where n is 2,3 or 4, R1 is lower alkyl R3 is hydrogen, lower alkyl, aryl(lower)alkyl lower alkenyl or lower, alkynyl and R8 is hydrogen or lower alkyl from compounds of formula, where n and R1 are as above and R is hydrogen lower, alkyl or aryl(lower)alkyl. The products have pharmacological activity, particularly analgesic activity.
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 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
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.