Title:
Indicator device for bearing failures in drill bits
United States Patent 3062302


Inventors:
Toth, Frederick J.
Toomey, David F.
Application Number:
US2790360A
Publication Date:
11/06/1962
Filing Date:
05/09/1960
Assignee:
SHELL OIL CO
Primary Class:
Other Classes:
175/40
International Classes:
E21B12/02
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US Patent References:
2798764Thermostatic control system1957-07-09
2633025Means for indicating temperatures1953-03-31
2560328Dull bit indicator1951-07-10
2457960Drill bit1949-01-04
2246536Thermostat and other thermomotive means1941-06-24