Procedure for obtaining derivatives of acetic acid
CA 2070176 C · Owner: Ochoa Gomez, Jose Ramon · Inventors: Ochoa Gomez, Jose Ramon; Martin, Ramon, Juan Luis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A procedure for obtaining derivatives of acetic acid such, as glycine, IDA and NTA by dehydrogenating monodi- and, tri-ethanolamine, respectively in the presence of a Raney copper, catalyst. This procedure includes a stage consisting of regenerating the used catalyst in order to be able to reuse it in successive reaction cycles. The regeneration process consists of treating the used catalyst with formic acid under reflux, filtering it and digesting it with demineralized water and NaOH until the wash water reaches a slightly alkaline value. The regenerated catalyst may be reused in successive reaction cycles whilst maintaining an average yield of 87% that is, of the same order of magnitude …
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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 October 3, 1991 and granted June 1, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 3, 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.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.