Charles F. Sprague

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Pilot operated safety relief valve adapted for low fluid pressures
- Patent number 5,992,449
- Issue date Nov 30, 1999
- Groth Corporation
- Charles F. Sprague
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Diaphragm operated regulator valve for maintaining low gas pressure
- Patent number 5,931,188
- Issue date Aug 3, 1999
- Groth Corporation
- Charles F. Sprague
- G05 - CONTROLLING REGULATING