David Mildren

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Screw thread structure for percussion drill driver sub and case
- Patent number 5,163,523
- Issue date Nov 17, 1992
- Sandvik Rock Tools, Inc.
- Faisal J. Yousef
- E21 - EARTH DRILLING MINING
Information Patent Grant
Screw thread coupling
- Patent number 5,060,740
- Issue date Oct 29, 1991
- Sandvik Rock Tools, Inc.
- Faisal J. Yousef
- E21 - EARTH DRILLING MINING
Information Patent Grant
Screw thread structure
- Patent number 5,056,611
- Issue date Oct 15, 1991
- Galloway Trust
- Faisal J. Yousef
- E21 - EARTH DRILLING MINING