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Expired Canadian patentCanada

Method of initiating underground in-situ combustion

CA 1013559 A · Owner: Deutsche Texaco Aktiengesellschaft · Inventors: Pusch, Gunter; Gedenk, Rudolf

CIPO record

Overview

Drawings and full text

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

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Read the whole patent

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.

Why it's free to use

  • Granted July 12, 1977. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 12, 1994.
  • 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—
GrantedJuly 12, 1977
Term endedJuly 12, 1994
Patent numberCA 1013559 A
Classification (IPC)F42D1/00 +2 more

Timeline

Timeline From CIPO dates

197819801982198419861988199019921994Patent grantedJuly 12, 1977Term endedJuly 12, 1994

Sources & verification

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