Process for the production of earth alkali metal salts of 2-pyrrolidon-5-carboxylic acid
CA 1324384 C · Owner: Werner, Silvia · Inventors: Werner, Silvia; Krimmer, Hans-Peter; Drauz, Karlheinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Earth alkali metal salts of 2-pyrrolidon-5-carboxylic acid (pyroglutamic acid) are produced by heating the corresponding earth alkali metal salt of the glutamic acid while retaining, the solid state, to a temperature in the range from 120 to 250°C, until the reaction water of the intramolecular condensation (cyclocondensation) has been completely driven off.
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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
- Granted November 16, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 16, 2010.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.