Carbonate derivatives of eseroline, a process for their preparation and their use as medicaments
CA 2013087 C · Owner: Aventis Holdings Inc. · Inventors: Glamkowski, Edward J.; Chiang, Yulin; Kurys, Barbara E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to 1, 2, 3, 3a, 8 8a-hexahydro-1, 3a, 8-, trimethylpyrrolo 2, 3-b indol-5-o1 carbonate esters of the fomula (see formula I), cycloalkyl, aryl, aralkyl or (see formula II), hydrogen or halogen; the pharmaceutically acceptable acid addition salts thereof and where applicable to the geometric and optical isomers and racemic mixtures thereof. The compounds of this invention display utility as analgesic agents.
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
- Filed March 26, 1990 and granted December 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2012.
- 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.