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Expired Canadian patentCanada

Apparatus and method for in situ controlled heat processing of hydrocarbonaceous formations

CA 1204167 A · Owner: Iit Research Institute · Inventors: Taflove, Allen; Bridges, Jack E.

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Abstract From the Canadian patent

A system and method for the controlled in situ heat processing of hydrocarbonaceous earth formations involves the application of electromagnetic energy at a selected frequency or at selected frequencies to a waveguide structure formed by electrodes bounding a particular volume of hydrocarbonaceous material. Terminating one end of the structure with different impedances at different times produces electric field standing waves of different respective phase at that end at a selected frequency. Two standing waves substantially 90° out of phase in formations having relatively uniform dielectric properties result in substantially uniform application of heating power if the product of the …

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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 May 6, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 6, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 28, 1983
GrantedMay 6, 1986
Term endedMay 6, 2003
Patent numberCA 1204167 A
Classification (IPC)E21B43/24 +2 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedJan 28, 1983Patent grantedMay 6, 1986Term endedMay 6, 2003

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