Difluoromethylenandrostenone derivatives and process for their preparation
CA 2106457 A1 · Owner: Buzzetti, Franco · Inventors: Di Salle, Enrico; Buzzetti, Franco; Crugnola, Angelo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to new 6-difluoromethylenandrostenones having formula (I) wherein the symbol -^_-^_-^_ represents a double or single bond; R is hydrogen or C1-C4 alkyl; and A is a =C=O =CH$(1,3)$OH or =CH$(1,3)$OR1 group, in which R1 is an acyl group, which are useful as steroidal aromatase inhibitors.
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 January 18, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 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.