Powell; Walter W.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Powell; Walter W..The latest application filed is for "pilot operated safety relief valve".
- Powell; Walter W. - Sugar Land TX
- Powell; Walter W. - Sugarland TX
- Powell; Walter W. - Peculiar MO
- Powell; Walter W. - Houston TX
| Patent | Date |
|---|---|
| Pilot operated safety relief valve Grant 5,842,501 - Powell , et al. December 1, 1 | 1998-12-01 |
| Pressure relief valves adapted for low pressure operation Grant 5,555,910 - Powell , et al. September 17, 1 | 1996-09-17 |
| Sealing means for pressure relief valves and methods of assembly Grant 5,499,648 - Powell , et al. March 19, 1 | 1996-03-19 |
| Direct spring pressure operated valve Grant 5,341,838 - Powell August 30, 1 | 1994-08-30 |
| Shuttle valve Grant 5,329,968 - Powell July 19, 1 | 1994-07-19 |
| Low-pressure pilot valve Grant 5,163,471 - Powell November 17, 1 | 1992-11-17 |
| Safety relief system for control or vent valves Grant 4,705,065 - McNeely , et al. November 10, 1 | 1987-11-10 |
| Vacuum-type article holder and methods of supportively retaining articles Grant 4,428,815 - Powell , et al. January 31, 1 | 1984-01-31 |
| Valve Grant 3,913,885 - Greenwood , et al. October 21, 1 | 1975-10-21 |
| Relief Valve Grant 3,722,852 - Powell , et al. March 27, 1 | 1973-03-27 |
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