Benzomorphane derivatives
CA 1074310 A · Owner: Sumitomo Chemical Company · Inventors: Harada, Shuichi; Mizote, Hiroyuki; Katsube, Junki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
BENZOMORPHAN DERIVATIVES, ABSTRACT OF THE DISCLOSURE 2-Substituted-2'-methyl-6,7-benzomorphan derivatives of the formula:, I, wherein R1 and R2 are each hydrogen or C1-C3 alkyl; and R3 is hydrogen, halogen or C1-C3 alkyl and, pharmaceutically acceptable salts thereof which are, useful as non-addicting analgesics with sedative effects are prepared by the reaction of a 6,7-benzomorphan derivative of the formula:, II, wherein R1 and R2 are as defined above with a reactive, derivative of an alcohol compound of the formula: III, wherein X is an optionally protected carbonyl group; and R3 is as defined above, optionally followed by the elimination of the protective group of the carbonyl group or, …
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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 March 25, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 25, 1997.
- 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.