Octahydrophenanthrene derivatives
CA 2111138 A1 · Owner: F. Hoffmann-La Roche Ag · Inventors: Gutknecht, Eva-Maria; Godel, Thierry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Octahydrophenanthrene derivatives Compounds of the general formula, I, wherein R1 and R2 each individually signify hydrogen or lower alkyl optionally substituted by aryl or C3-6-cycloalkyl; R4 and R5 either both signify hydrogen or both signify halogen or one signifies hydrogen and the other signifies halogen hydroxy, lower alkoxy, aryloxy or amino and R3 signifies hydrogen or, where no primary or secondary amino group(s) is/are present, alkanoyl as well as pharmaceutically usable salts of compounds of formula 1 with acids have valuable pharmacodynamic properties as noncompetitive NMDA antagonists and can accordingly be used as neuroprotectives. These compounds are novel with the exception …
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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
- Filed December 10, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2015.
- 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.