3-substituted nitro-steroid derivatives as 5-.alpha.-reductase inhibitors
CA 2023610 A1 · Owner: Metcalf, Brian W. · Inventors: Holt, Dennis A.; Metcalf, Brian W.; Levy, Mark A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
3-SUBSTITUTED NITRO-STEROID DERIVATIVES AS 5-.alpha.-REDUCTASE INHIBITORS Invented are 3-nitro- substituted steroidal synthetic compounds, pharmaceutical compositions containing the compounds, and methods of using these compounds to inhibit steroid 5-.alpha.-reductase including using these compounds to reduce prostate size. Also invented are intermediates used in preparing these compounds.
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 August 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 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.