Expired Canadian patentCanada
Process for the preparation of .alpha.-l-aspartyl-l-phenylalanine methyl ester hydrochloride by use of isolated n-formyl-aspartic anhydride
CA 2021180 C · Owner: Gelman, Yefim · Inventors: Gelman, Yefim; Hill, John B.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of .alpha.-L-aspartyl-L-phenylalanine methyl ester hydrochloride (.alpha.-APM(HCl)) is disclosed. .alpha.-APM(HCl) is an intermediate in the preparation of aspartame.
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 July 13, 1990 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 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.
FiledJuly 13, 1990
GrantedJune 23, 1998
Term endedJuly 13, 2010
Patent numberCA 2021180 C
Classification (IPC)C07K5/07
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.