Process for producing aminocarboxylic acid salt
CA 2074486 C · Owner: Nippon Shokubai Co. Ltd. · Inventors: Urano, Yoshiaki; Kadono, Yukio; Goto, Takakiyo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a novel process for producing an aminocarboxylic acid salt which is useful as a material for agricultural chemicals and drugs, a chelating agent, a food additive etc. The, process produces an aminocarboxylic acid salt from an aminoalcohol by subjecting the aminoalcohol to an oxidative dehydrogenation reaction in the coexistence of an alkali metal hydroxide and/or an alkaline earth metal hydroxide, a copper-containing catalyst and water and is, characterized by performing the reaction while maintaining the nickel concentration in the reaction mixture at 40 ppm or less.
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 November 26, 1991 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 26, 2013.
- 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.