Method and apparatus for uniformly heating long subterranean intervals at high temperature
CA 1250340 A · Owner: Shell Canada Limited · Inventors: Vanmeurs, Peter; Van Egmond, Cornelis F.H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Long intervals of subterranean earth formations are heated at high temperatures for long times with an electrical heater containing spoolable, steel-sheathed, mineral-insulated cables which have high electrical conductivities, enabling them to heat the earth formations at a substantially uniform rate of more than about 300 watts per metre at temperatures between about 600 and 1000 °C with a pattern of localized electrical resistances which are correlated with the heat conductivities of the earth formations and the heat stabilities of materials providing power and support for the heater.
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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 February 21, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 21, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.