Process for the separation of r and s-2,2-r, r-1,3-dioxolane-4-carboxylic acid
CA 2029173 A1 · Owner: Raven, Hubertus Gerardus Maria · Inventors: Raven, Hubertus Gerardus Maria; Groen, Paulus Bernardus Maria; Leenderts, Everardus Johannus Anthonius Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the separation of R and S-2,2-R1,R2-1,3dioxolane-4-carboxylic acid, A process is disclosed for preparing a 2,2-R1,R2-1,3dioxolane-4-carboxylic acid or salt thereof rich in either the R or S enantiomer which process comprises a) preparing a solution which contains a nonracemic mixture of R and S enantiomer of a carboxylate of the formula, (I), and Mn+ ions, wherein R1 and R2 are each independently, H or an, unsubstituted or substituted alkyl group or R1 and R2, together with the carbon atom to which they are attached form an unsubstituted or substituted carbocyclic ring and M, is an alkali metal, an alkaline earth metal a group IIb, metal, boron, or an ammonium di- or …
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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 November 1, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 1, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 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.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.