Title:
Earth boring drill bit
United States Patent 3140748
Inventors:
Engle, Edgar W.
Foster Jr., James L.
Publication Date:
07/14/1964
Export Citation:
Click for automatic bibliography generation
Assignee:
KENNAMETAL INC
Primary Class:
175/426
Other Classes:
175/421
International Classes:
E21B10/54; E21B10/56; E21B10/46
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US Patent References:
3106973Rotary drill bits
2693938Drilling bit
1978084Well drilling bit
1923488Well bit
1923487Well drilling bit
Foreign References:
FR1228941A