David M. Tatum

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Sealing assembly for relatively movable members
- Patent number 5,251,914
- Issue date Oct 12, 1993
- David M. Tatum
- E21 - EARTH DRILLING MINING
Information Patent Grant
Sealing assembly for relatively movable members
- Patent number 5,009,519
- Issue date Apr 23, 1991
- David M. Tatum
- E21 - EARTH DRILLING MINING
Information Patent Grant
Seal and seal shield assembly for rotary drill bits
- Patent number 4,762,189
- Issue date Aug 9, 1988
- David M. Tatum
- E21 - EARTH DRILLING MINING