2.beta.19-methyleneamino bridged steroids as aromatase inhibitors
CA 2096020 C · Owner: Merrell Dow Pharmaceuticals Inc. · Inventors: Johnston, J. O'Neal; Peet, Norton P.; Burkhart, Joseph P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to 2.beta.19-(methyleneamino)androst-4-ene- 3,17-dione and the corresponding 17.beta.-ol which are useful as aromatase inhibitors. The compounds are prepared by the cyclization of an appropriate 19-N-protected-(2-methoxyethoxy)methylamino steroid using titanium tetrachloride followed by if , desired, selective reduction of the 17-ketone.
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 October 17, 1991 and granted June 17, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 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.