Method for preparing 17.alpha.-acetoxy-11.beta.-(4-n,n-dimethylaminophenyl)-19-norpregna-4,9-diene-3,20-dione, intermediates thereof, and methods for the preparation of such intermediates
CA 2516319 C · Owner: The Government Of The United States Of America, As Represented By The Secretary, Department Of Health And Human Services · Inventors: Rao, Pemmaraju N.; Simmons, Anne-Marie; Kim, Hyun K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods for the preparation of the 19-norprogesterone of formula I and its intermediates, in crystalline and amorphous forms.
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 13, 2004 and granted September 18, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 13, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2026.
- 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.