Method for preparing and purifying an n-alkylated aspartame derivative
CA 2278608 C · Owner: The Nutrasweet Company · Inventors: Prakash, Indra
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is disclosed for preparing and purifying N-N-(3,3-dimethylbutyl)-L- .alpha.-aspartyl-L-phenylalanine 1-methyl ester from aspartame and 3,3dimethylbutyraldehyde by hydrogenation in an organic solvent solution followed by the formation of an aqueous/organic solvent solution having an organic solvent content of about 17 % to about 30 % by weight of the aqueous/organic solvent solution.
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 January 29, 1998 and granted March 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 2020.
- 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.