Method of crystallizing .alpha.-l-aspartyl-l-phenylalanine methyl ester
CA 2069259 C · Owner: Ajinomoto Co. Inc. · Inventors: Kishimoto, Shinichi; Takeda, Hideo; Abe, So
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In crystallizing .alpha.-APM from its aqueous solvent in a crystallizer, the pressure in the crystallizer is held at not higher than atmospheric pressure, a water or water/alcohol mixed solution of .alpha.-APM is fed into the crystallizer with stirring so that the solvent is vaporized and the, crystallizing solution is cooled and crystallized by the latent heat of vaporization or is heated so as to prevent supercooling.
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 May 22, 1992 and granted July 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 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.
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.