Salt of (2s,3s)-3-(1s)-1-isobutoxymethyl-3-methylbutylcarbamoyloxirane-2-carboxylic acid
CA 2523233 C · Owner: Nihashi, Susumu · Inventors: Tendo, Atsushi; Okai, Kazuki; Nihashi, Susumu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to purification of (2S,3S)-3- (1S)-1-isobutoxymethyl-3-methylbutylcarbamoyloxirane- 2-carboxylic acid hereinafter, referred to as the carboxylic acid using the salt of the carboxylic acid with an organic amine selected from the group consisting of piperazine, adamantane amines and others. The invention also relates to providing crystalline sodium salt of the carboxylic acid. The sodium salt is usable as a material for preparing medicaments and improved in storage stability, and has the following characteristics: DSC: exothermic peak observed at a temperature in the range of 170 to 175°C with weight decrease; and characteristic absorption bands of infrared …
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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 April 22, 2004 and granted March 20, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 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
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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.