Fluorinated 4-aminoandrostadienone derivatives and process for their preparation
CA 2118317 A1 · Owner: Pharmacia & Upjohn S.P.A. · Inventors: Longo, Antonio; Di Salle, Enrico; Buzzetti, Franco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to compounds of formula (I) wherein (x) and (y) are single or double bonds; A is (1) or (2); R and R3 are hydrogen or acyl; R1 is hydrogen or fluorine; and wherein: when (y) is a single bond, R2 is hydrogen fluorine methyl, trifluoromethyl; when (y) is a double bond R2 is methylene, provided that when one of (x) or (y) is a double bond the other is a single bond and at least one of R1 and R2 is fluorine or trifluoromethyl and the pharmaceutically acceptable salts thereof. The compounds of formula (I) are useful as 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 February 1, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 1, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 1, 2016.
- 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.