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Expired Canadian patentCanada

Microencapsulated alkaloidal material

CA 1113232 A · Owner: Celanese Corporation · Inventors: Hart, Ronald L.; Davis, Danny A.; Bayless, Robert G.

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Abstract From the Canadian patent

Microcapsules having a core of an alkaloidal material surrounded by a protective cross-linked polymeric wall are disclosed. The microcapsules are produced by intermixing a polymeric wall material with a liquid vehicle to form a solution thereof as a continuous first phase, and mixing the solution with an alkaloidal material. ?he produced admixture is agitated to disperse the alkaloidal material as a plurality of discrete minute core material entities in the first phase and thereafter, phase separation is induced to separate the polymeric wall material from the liquid vehicle so that the wall material forms embryonic sheaths about the core material entities. The polymeric wall material is …

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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 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 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 13, 1979
GrantedDecember 1, 1981
Term endedDecember 1, 1998
Patent numberCA 1113232 A
Classification (IPC)A24B15/00 +2 more

Timeline

Timeline From CIPO dates

1980198219841986198819901992199419961998Application filedMarch 13, 1979Patent grantedDec 1, 1981Term endedDec 1, 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.