Electric oil well heater apparatus
United States Patent 3114417

Inventors:
Mccarthy, Patrick B.
Publication Date:
12/17/1963
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Assignee:
Ernest, Saftig T.
Stansbury, Burton J.
Paul, Loveridge F.
Peggy, Mccarthy L.
Primary Class:
166/60
Other Classes:
392/304
International Classes:
E21B36/04; E21B36/00
US Patent References:
2771140Subsurface igniter
2808110Oil well heater
2881301Fluid heater
2893490Oil well heater
2932352Liquid filled well heater