Title:
Well heater
United States Patent 2836248
US Patent References:
/1291302.html
- - 1291302

/1426407.html
- - 1426407

Electric well heater
- - 1516836

Oil-well heater
- - 1525656

Oil-well heater
- - 1535776


Inventors:
Covington, James M.
Publication Date:
05/27/1958
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Assignee:
UNION OIL CO
Primary Class:
166/61
Other Classes:
392/302, 392/480
International Classes:
E21B36/04; E21B36/00
US Patent References:
1681523Apparatus for heating oil wells
1835400Oil well heater
2615114Electric oil well heater
2647196Apparatus for heating oil wells