Stereoselective hydrogenation process
CA 2019407 C · Owner: Piroska, Major · Inventors: Polgar, Istvan; Balogh, Katalin; Foldesi, Jozsef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a novel stereoselective process for the preparation of dihydrolysergol from lysergol by hydrogenation in the presence of solvent and palladium catalyst applied on a carrier which, comprises hydrogenating lysergol in the presence of one or more aprotic solvent(s) containing tertiary nitrogen atom(s) and a palladium catalyst applied on activated carbon, and then recovering the product obtained from the reaction mixture in a known manner.
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 June 20, 1990 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 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.