Phosphonic acid substituted aromatic steroids as inhibitors of steroid 5 -reductase
CA 2004946 A1 · Owner: Metcalf, Brian W. · Inventors: Metcalf, Brian W.; Levy, Mark A.; Holt, Dennis A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PHOSPHONIC ACID SUBSTITUTED AROMATIC STEROIDS AS INHIBITORS OF STEROID 5-.alpha.-REDUCTASE Invented are phosphonic acid substituted analogues of steroidal synthetic compounds, pharmaceutical compositions containing these compounds, and methods of using these compounds to inhibit steroid 5-.alpha.-reductase including using these, compounds to reduce or maintain 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 December 8, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2011.
- 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.