Title:
Oil well heater
United States Patent 2893490
Inventors:
Williams, Ernest E.
Ward, Bertrand M.
Publication Date:
07/07/1959
Export Citation:
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Assignee:
PETRO FLOW CORP
Primary Class:
166/60
Other Classes:
392/301, 439/502
International Classes:
E21B36/04; E21B36/00
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US Patent References:
2742555Flame boring apparatus
2306206Electric coupling
1504208Electrical heater for oil wells
1169262N/A