Orally active nonaddicting analgesics
CA 1313868 C · Owner: Sri International · Inventors: Degraw, Joseph Irving; Lawson, John Arthur; Loew, Gilda Harris
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Stereoisomerically pure forms of normorphine analogs which have superior or analgesic and nonaddicting qualities are described. In addition, a method of separating diastereomeric forms of N-sec-alkylsubstituted analogs utilizes the hydrocarbyl(1-8C) diesters of the normorphine derivatives. A new method for preparing the N-methylalkylmethyl derivatives of normorphine and norcodeine and their conventional analogs is also disclosed. This method employs the corresponding methyl alkyl ketones and a reducing agent. The invention relates to compounds of the formula: (1), and the pharmaceutically acceptable acid addition salts thereof. wherein, Y is OH or OMe;, the dotted line indicates the …
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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 February 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 23, 2010.
- 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.