Method for crystallization of .alpha.-l-aspartyl-l-phenylalanine methyl ester
CA 2081869 C · Owner: Ajinomoto Co. Inc. · Inventors: Kishimoto, Shinichi; Abe, Sou
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of crystallizing ~-L-aspartyl-Lphenylalanine methyl ester comprises cooling a crystallizing solution of ~-L-aspartyl-L-phenylalanine methyl ester by indirect heat exchange with a coolant the, crystallizing solution of ~-L-aspartyl-L-phenylalanine methyl ester having a temperature no more than 20°C higher than the temperature of the coolant, stirring the crystallizing solution of ~-L-aspartyl-L-phenylalanine methyl ester and circulating the coolant while continuously feeding an aqueous solution of ~-L-aspartyl-Lphenylalanine methyl ester to the crystallizing solution of ~-L-aspartyl-L-phenylalanine methyl ester. The method of the invention enables one to reduce the amount of scale …
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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 October 30, 1992 and granted July 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 2014.
- 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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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.