William L. Shepherd

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West University, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Relief valve
- Patent number 6,202,766
- Issue date Mar 20, 2001
- William L. Shepherd
- E21 - EARTH DRILLING MINING
Information Patent Grant
Spaced button thrust surface for earth boring bit
- Patent number 4,451,162
- Issue date May 29, 1984
- Hughes Tool Company
- William L. Shepherd
- E21 - EARTH DRILLING MINING
Information Patent Grant
Kelly head for hydraulic mast digger
- Patent number 4,261,251
- Issue date Apr 14, 1981
- Hughes Tool Company
- William L. Shepherd
- E21 - EARTH DRILLING MINING
Information Patent Grant
Downcrowding device for earth boring machines
- Patent number 4,150,727
- Issue date Apr 24, 1979
- Hughes Tool Company
- William L. Shepherd
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rock bit with quick change connection
- Patent number 3,986,570
- Issue date Oct 19, 1976
- Hughes Tool Company
- Leon B. Stinson
- E21 - EARTH DRILLING MINING