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