Method of purifying plavastatin
CA 2425883 A1 · Owner: Sugio, Nobunari · Inventors: Suzuki, Mutsuo; Hamano, Kiyoshi; Kojima, Shunshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of isolating or purifying plavastatin or its pharmacologically acceptable salt characterized by involving in the process of isolating or , purifying plavastatin or its pharmacologically acceptable salt the step of , extracting plavastatin by using an organic solvent represented by the formula CH3CO2R (wherein R represents alkyl having 3 or more carbon atoms) or the step of decomposing impurities by using an inorganic acid/an inorganic base; and compositions containing plavastatin sodium thus obtained.
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 15, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 15, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 2023.
- 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.