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Expired Canadian patentCanada

Removal of sulfur contaminants from hydrocarbons using n-halogeno compounds

CA 2097584 C · Owner: Exxon Chemical Patents Inc. · Inventors: Ou, John D.

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

The present invention is directed to a process for removal of sulfur contaminants from hydrocarbons using processes which rely upon the reaction of organosulfur compounds with N-halogeno compounds. The sulfur removal may be effected by using liquid/liquid extraction processes or one of two reactive adsorption processes involving injecting a stoichiometric amount of N-halogeno compounds into hydrocarbon and then passing the stream through an adsorbent column to adsorb the N-halogeno-sulfur compounds and any unreacted N-halogeno compounds; or using adsorbents which are pre-loaded with N-halogeno compounds which are placed in a fixed-bed column for sulfur removal.

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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

  • Filed November 19, 1991 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 19, 2011.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 2013.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 19, 1991
GrantedApril 2, 2002
Term endedNovember 19, 2011
Patent numberCA 2097584 C
Classification (IPC)C07C11/16 +2 more

Timeline

Timeline From CIPO dates

1992199419961998200020022004200620082010Application filedNov 19, 1991Patent grantedApril 2, 2002Term endedNov 19, 2011

Sources & verification

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