Improved method for the preparation of an aspartame-derived compound useful as a sweetener
CA 2187901 C · Owner: Nofre, Claude · Inventors: Nofre, Claude; Tinti, Jean-Marie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and preparation of N-N-(3,3,-dimethylbutyl)-L-.alpha.-aspartyl-Lphenylalanine 1-methyl ester of formula (I) useful as a, sweetener. The method is characterized in that a hydroalcohol solution comprising aspartame and 3,3-dimethylbutyraldehyde and having a pH of 4.5-5 is treated with hydrogen at ambient temperature and at a pressure not exceeding 1 bar in the presence of a catalyst selected from the group consisting of platinum or palladium on activated carbon or , platinum black or palladium black and in that the produit is, purified by precipitation and filtration after the alcohol part of the solvent is eliminated by the use of a vacuum.
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 5, 1995 and granted September 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2017.
- 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.