Process for the preparation of pyrrolidonecarboxylic acid/metal/amine complexes
CA 1106381 A · Owner: Ciba-Geigy Investments Ltd. · Inventors: Lohse, Friedrich; Stockinger, Friedrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of pyrrolidone- 5-carboxylic acid/metal salt/amine complexes by reacting 1 mol of a L-glutamic acid lower alkyl ester/metal salt complex with 1 mol of an aliphatic, cycloaliphatic or aromatic-alipbatic diamine or 2 mols of an aliphatic or cycloaliphatic monoamine in a polar solvent with the, eliminatior of 2 mols of aleohol. The complex compounds prepared according to the invention are valuable curing agents for epoxide resins.
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
- Granted August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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.