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Expired Canadian patentCanada

Method of and column for the desulfurization of industrial flue gases

CA 1251919 A · Owner: Bischoff (Gottfried) Bau Kompl. Gasreinigungs- Und Wasserruckkuhlanlagen G.M.B.H. & Co. Kommanditgesellschaft · Inventors: Hegemann, Karl-Rudolf; Kleeberg, Ulrich

CIPO record

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Abstract From the Canadian patent

A method of and an apparatus for the desulfurization of an industrial flue gas wherein the recirculating scrubbing liquid is sprayed with atomization into the scrubbing zone of a column and the droplet size degree of, atomization and gas flow velocity are controlled so that the pH of the scrubbing liquid within the scrubbing zone is substantially 3 to 6 preferably, 4 to 5. In the sump oxidation is carried out by the introduction of oxygen to oxidize the calcium sulfite and calcium hydrogen sulfite which is formed to calcium sulfate.

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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 April 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 4, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 16, 1984
GrantedApril 4, 1989
Term endedApril 4, 2006
Patent numberCA 1251919 A
Classification (IPC)B01D53/34 +2 more

Timeline

Timeline From CIPO dates

19851988199119941997200020032006Application filedAug 16, 1984Patent grantedApril 4, 1989Term endedApril 4, 2006

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