Jo-Yu Chuang

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Sugar Land, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Shock absorbing bit retaining ring
- Patent number 4,924,948
- Issue date May 15, 1990
- Sandvik Rock Tools, Inc.
- Jo-Yu Chuang
- B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
Information Patent Grant
Pilot-valve-controlled percussion drilling tool
- Patent number 4,878,550
- Issue date Nov 7, 1989
- Sandvik Rock Tools, Inc.
- Jo-Yu Chuang
- E21 - EARTH DRILLING MINING
Information Patent Grant
Elliptical thread design
- Patent number 4,799,844
- Issue date Jan 24, 1989
- TRW Inc.
- Jo-Yu Chuang
- E21 - EARTH DRILLING MINING
Information Patent Grant
Apparatus for hard rock sidewall coring a borehole
- Patent number 4,714,119
- Issue date Dec 22, 1987
- Schlumberger Technology Corporation
- Joel J. Hebert
- E21 - EARTH DRILLING MINING