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Expired Canadian patentCanada

Method for the processing of organic compounds

CA 1332250 C · Owner: Welch, James Francis · Inventors: Siegwarth, James D.; Welch, James Francis

CIPO record

Overview

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

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Abstract From the Canadian patent

This invention provides a method for the detoxification of aqueous solutions of organic compounds utilizing a liquid-phase oxidant such as hydrogen peroxide (aq) or ozone (aq). The aqueous solutions of organic compounds and the liquid-phase oxidant are mixed then compressed and heated to bring the mixture into a supercritical phase. The oxidation reaction proceeds in the supercritical phase.

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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 4, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 4, 2011.
  • 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 17, 1989
GrantedOctober 4, 1994
Term endedOctober 4, 2011
Patent numberCA 1332250 C
Classification (IPC)C02F1/74 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedMarch 17, 1989Patent grantedOct 4, 1994Term endedOct 4, 2011

Sources & verification

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