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Expired Canadian patentCanada

Process for preparing aniline compounds

CA 1113963 A · Owner: Ethyl Corporation · Inventors: Walter, Thomas J.

CIPO record

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Abstract From the Canadian patent

An improved process is provided for the production of thioalkyl aniline compounds, which are known and useful as intermediates for producing anthelmintic antibacterial, and fungicidal benzimidazole compounds. According to the process a thiocyano aniline compound, an alcohol and an alkali metal cyanide are reacted, with the additional presence of an alkyl halide, and also with a dipolar aprotic solvent, or in the presence of an immiscible solvent and a phase transfer catalyst. A further improvement consists of providing said phase transfer catalyst as a polymer-bound catalyst.

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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 December 8, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 8, 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.
FiledMarch 14, 1979
GrantedDecember 8, 1981
Term endedDecember 8, 1998
Patent numberCA 1113963 A
Classification (IPC)B01J27/00

Timeline

Timeline From CIPO dates

1980198219841986198819901992199419961998Application filedMarch 14, 1979Patent grantedDec 8, 1981Term endedDec 8, 1998

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.