Fred S. Wong

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Subsurface safety valve
- Patent number 4,603,742
- Issue date Aug 5, 1986
- Hydril Company
- Fred S. Wong
- E21 - EARTH DRILLING MINING
Information Patent Grant
Subsurface safety valve
- Patent number 4,552,219
- Issue date Nov 12, 1985
- Hydril Company
- Fred S. Wong
- E21 - EARTH DRILLING MINING