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Expired Canadian patentCanada

Nuclear heating of oil-bearing formations

CA 1098818 A · Owner: Alspaw, D. Ivan · Inventors: Alspaw, D. Ivan

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Abstract From the Canadian patent

Abstract, A method and apparatus are provided for using heat generated by absorption of radiation from nuclear waste materials to reduce the viscosity of petroleum products contained within a subsurface earth formation. The nuclear waste material is positioned in a salt water formation underlying the subsurface earth formation so that the radiation emitted by the material heats the salt water formation. Conduction and convection transfer the heat to the subsurface earth formation raising the, temperature and thereby reducing the viscosity of the petroleum products. To prevent radioactive contamination within the salt water formation, the nuclear waste material may be encapsulated in a …

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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 7, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 7, 1998.
  • 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 23, 1979
GrantedApril 7, 1981
Term endedApril 7, 1998
Patent numberCA 1098818 A
Classification (IPC)E21B43/24

Timeline

Timeline From CIPO dates

1980198219841986198819901992199419961998Application filedMarch 23, 1979Patent grantedApril 7, 1981Term endedApril 7, 1998

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