Method for preparing acid addition salts of polyacidic basic compound
CA 2516822 C · Owner: Kowa Co. Ltd. · Inventors: Shibuya, Kimiyuki; Ohgiya, Tadaaki; Matsuda, Takayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a method for preparing an acid addition salt of a polyacidic basic compound or a , water adduct having basic site(s) stronger than pyridine. The method comprises reacting the polyacidic basic compound with an acid salt of pyridine. By the present invention the number of moles of an , added acid in the acid addition salt of the polyacidic basic compound can be readily changed to a number suited for the polyacidic basic compound as needed.
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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 27, 2004 and granted September 25, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 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.