Melvin J. Hargraves

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Lafayette, LA, US

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Patents Grantslast 30 patents

Information Patent Grant
Control valve having integral visual indicator for fluid safety sys...
- Patent number 4,194,529
- Issue date Mar 25, 1980
- W-K-M Wellhead Systems, Inc.
- Melvin J. Hargraves
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Control valve having integral visual indicator for fluid safety sys...
- Patent number 4,137,942
- Issue date Feb 6, 1979
- W-K-M Wellhead Systems, Inc.
- Melvin J. Hargraves
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...