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Expired Canadian patentCanada

Process for producing a para-substituted phenol derivative

CA 1234393 A · Owner: Hirai, Hidefumi · Inventors: Komiyama, Makoto; Hirai, Hidefumi

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

By reacting a phenol compound with an organic halide selected from the group consisting of a haloform a carbon tetrahalide and a substituted or unsubstituted allyl halide in the presence of an alkali metal hydroxide, using as a catalyst a fixed cyclodextrin having hydroxyl groups crosslinked with a bivalent hydrocarbon group having free valences at its both ends said hydrocarbon group having at least one hydrogen atom substituted or unsubstituted with a member selected from the group consisting of an alkyl group a halogen atom, and a hydroxyl group and containing or not containing at least one combination of two neighboring carbon atoms having therebetween at least one member selected from …

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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 March 22, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 22, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 10, 1985
GrantedMarch 22, 1988
Term endedMarch 22, 2005
Patent numberCA 1234393 A
Classification (IPC)C07C49/83 +1 more

Timeline

Timeline From CIPO dates

1986198819901992199419961998200020022004Application filedApril 10, 1985Patent grantedMarch 22, 1988Term endedMarch 22, 2005

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