Apparatus
United States Patent 2722278
US Patent References:
Apparatus for sealing crevices in rock formations or the like
- - 1715592
Oil well heater
- - 1835400
Electric heater for subsurface materials
- - 2484063
Oil well furnace
- - 2506853
Apparatus for sealing crevices in rock formations or the like
- - 1715592
Oil well heater
- - 1835400
Electric heater for subsurface materials
- - 2484063
Oil well furnace
- - 2506853
Inventors:
Kaasa, Orin G.
Publication Date:
11/01/1955
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Export Citation:
Assignee:
SINCLAIR OIL AND GAS COMPANY
Primary Class:
Other Classes:
219/260, 392/304, 166/60
International Classes:
E21B36/02; E21B36/04; E21B36/00