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Expired Canadian patentCanada

Dust collecting system for coke oven

CA 1068636 A · Owner: Kansai Netsukagaku Kabushiki Kaisha · Inventors: Kakumura, Kentaro; Ueno, Hajime; Sato, Yorito

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

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Abstract From the Canadian patent

The present invention provides in the operation of a coke oven including a coke discharge step and a coal charge step at which step a dust containing gas is discharged a method, of collecting dust from said gases which comprises passing said gases to a common bag filter dust collector the gases, from said coke discharge step being first passed to said collector to deposit a fine layer of coke particles on the filter and then alternately repeating collection of dust containing gases from said steps into said filter whereby tar mists contained in said gas from said coal charge step are deposited in the layer of fine coke particles. The present invention also provides dust in the coal …

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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 25, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 25, 1996.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedDecember 25, 1979
Term endedDecember 25, 1996
Patent numberCA 1068636 A
Classification (IPC)C10B27/00 +2 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedDec 25, 1979Term endedDec 25, 1996

Sources & verification

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