Robert W. Hughes

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Easton, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Two piece down hole drill chuck
- Patent number 4,706,764
- Issue date Nov 17, 1987
- Ingersoll-Rand Company
- Robert W. Hughes
- E21 - EARTH DRILLING MINING
Information Patent Grant
Threaded engagement means
- Patent number 4,551,050
- Issue date Nov 5, 1985
- Ingersoll-Rand Company
- Robert W. Hughes
- E21 - EARTH DRILLING MINING
Information Patent Grant
Plural-part earth bit, and an improved bit head therefor
- Patent number 4,505,343
- Issue date Mar 19, 1985
- Ingersoll-Rand Company
- Robert W. Hughes
- E21 - EARTH DRILLING MINING
Information Patent Grant
Plural-part earth bit, and an improved bit head therefor
- Patent number 4,413,689
- Issue date Nov 8, 1983
- Ingersoll-Rand Co.
- Robert W. Hughes
- E21 - EARTH DRILLING MINING