Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6668853 | Pressure relief valve with field-replaceable high corrosion-resistant components | — | 2003-12-30 |
| 6213449 | Handles for bottom outlet valve assembly | Ralph G. Portis | 2001-04-10 |
| 6112762 | Top operated bottom outlet valve assembly | Krzysztof A. Pankiewicz | 2000-09-05 |
| 5886312 | Switch level control for tank ullage determining system | Gaston C. Barmore, Jr., Joseph C. Fiore, Norman A. Magiera, Jerzy Drazkowicz, Carl J. Campagna +1 more | 1999-03-23 |
| 5544675 | Frangible valve handle | — | 1996-08-13 |
| 5394650 | Manway cover balancing mechanism | — | 1995-03-07 |
| 5342026 | Valve including resilient mount for pin | — | 1994-08-30 |
| 5340078 | Actuator for valve | — | 1994-08-23 |
| 5269342 | T-fitting | Ralph G. Portis | 1993-12-14 |
| 5257771 | Powered actuator for valve | Ralph G. Portis | 1993-11-02 |
| 5165444 | Spill valve | — | 1992-11-24 |
| 4924703 | Tank-level alarm control system | John White | 1990-05-15 |
| 4489915 | Valve | Michael D. West | 1984-12-25 |
| 4190071 | Backflow prevention devices | Oliver Q. Dyer | 1980-02-26 |