S. J. Huang

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The Woodlands, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Drill bit inserts with interruption in gradient of properties
- Patent number 6,443,248
- Issue date Sep 3, 2002
- Smith International, Inc.
- Zhou Yong
- E21 - EARTH DRILLING MINING
Information Patent Grant
Drill bit inserts with zone of compressive residual stress
- Patent number 6,260,639
- Issue date Jul 17, 2001
- Smith International, Inc.
- Zhou Yong
- E21 - EARTH DRILLING MINING