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Expired Canadian patentCanada

Matrix treatment process for oil extraction applications

CA 1293923 C · Owner: Economides, Michael J. · Inventors: Economides, Michael J.; Prouvost, Laurent

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Abstract From the Canadian patent

Using the invented procedure a curve representing, pressure as a function of time is recorded in real time and then compared with the theoretical curve. The difference is attributed to the skin factor and the matrix treatment can thus be adjusted in real time until it reaches the desired skin value. High treatment efficiency and precision.

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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 January 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 7, 2009.
  • 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 29, 1988
GrantedJanuary 7, 1992
Term endedJanuary 7, 2009
Patent numberCA 1293923 C
Classification (IPC)E21B49/00 +1 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedMarch 29, 1988Patent grantedJan 7, 1992Term endedJan 7, 2009

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