Process for preparation of pyrryl-2-acetonitriles
CA 1064507 A · Owner: Ethyl Corporation · Inventors: Wiegand, Karl E.; Kao, James T.F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pyrryl-2-acetonitrile compounds are made by an improved process wherein a dialkyl-(pyrryl-2-methyl)-amine is reacted with an alkyl chloride or alkyl bromide having, up to two carbon atoms in the alkyl forming a corresponding, trialkyl-(pyrryl-2-methyl)-ammonium chloride quaternary salt which solution is then fed to an aqueous solution of alkali cyanide in the presence of a water-immiscible solvent the, alkali cyanide being in defined excess and the reaction being at a controlled temperature level.
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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 October 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 16, 1996.
- 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.