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Expired Canadian patentCanada

Method and system for treating drill cuttings slurries and the like

CA 1319637 C · Owner: Li, Ying H. · Inventors: Beer, Gary L.; Li, Ying H.

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Abstract From the Canadian patent

Drill cuttings, and similar slurries or mixtures oily solid particles, are treated by a dryer apparatus which vaporizes the liquid and discharges relatively large solid particles for disposal. Vapor and entrained solid fines are conveyed from the dryer to a condenser and then to a rotary drum vacuum filter having a precoated filter media disposed thereon. The solid fines are filtered by the filter media comprising diatomaceous earth or perlite and the clarified condensed liquid is conveyed to separator means for separating oil, water and any other liquids present. The filter media stripped from the filter and contaminated with entrapped solid fines is conveyed through the dryer means and …

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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 June 29, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 29, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 23, 1987
GrantedJune 29, 1993
Term endedJune 29, 2010
Patent numberCA 1319637 C
Classification (IPC)E21B21/06 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedOct 23, 1987Patent grantedJune 29, 1993Term endedJune 29, 2010

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