Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6386227 | Non-flowing pilot valve | — | 2002-05-14 |
| 5890508 | Main relief valve for safety relief system | — | 1999-04-06 |
| 5842501 | Pilot operated safety relief valve | Michael L. Cognevich | 1998-12-01 |
| 5555910 | Pressure relief valves adapted for low pressure operation | Milton Anderson, Louis R. Castaneda, Aciel Martin | 1996-09-17 |
| 5499648 | Sealing means for pressure relief valves and methods of assembly | Louis R. Castaneda | 1996-03-19 |
| 5341838 | Direct spring pressure operated valve | — | 1994-08-30 |
| 5329968 | Shuttle valve | — | 1994-07-19 |
| 5238021 | Diaphragm operated spring loaded regulator | Louis R. Castaneda | 1993-08-24 |
| 5163471 | Low-pressure pilot valve | — | 1992-11-17 |
| 4964435 | Shuttle valve | — | 1990-10-23 |
| 4870989 | High temperature safety relief system | Cleo M. Bickford, Larry A. Sample | 1989-10-03 |
| 4865074 | High temperature safety relief system | Cleo M. Bickford, Larry A. Sample | 1989-09-12 |
| 4848397 | High temperature safety relief system | Cleo M. Bickford, Larry A. Sample | 1989-07-18 |
| 4705065 | Safety relief system for control or vent valves | Michael D. McNeely | 1987-11-10 |
| 4672995 | Redundant pilot valve control system | — | 1987-06-16 |
| 4445531 | Pilot for safety valve | — | 1984-05-01 |
| 4428815 | Vacuum-type article holder and methods of supportively retaining articles | Gary A. Seifert | 1984-01-31 |
| 4425938 | Low pressure safety relief valve | Donald M. Papa | 1984-01-17 |
| 4388940 | Pressure relief device | — | 1983-06-21 |