8-ene-19, 11.bet.beta.-bridged steroids, their preparation and pharma ceutical formulations containing them
CA 2097079 A1 · Owner: Elger, Walter · Inventors: Ottow, Eckhardt; Elger, Walter; Neef, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described are 8-ene-19 11.beta.-bridged steroids of general, formula (I) which have a new structural feature in the form of a double bond between the 8 position and the 9 position. Also described is a method of preparing them. The substituents R1, R4-Y, R4'-Y', X and Z are defined in the specification. The new compounds have, in particular a, strong anti-progastational action and are suitable for the preparation of pharmaceutical formulations.
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 November 27, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2013.
- 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.