Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7559338 | Keyless fire hydrant protection system | Normand James Roy | 2009-07-14 |
| 5054374 | Rotary actuator | Robert A. Frenzel | 1991-10-08 |
| 5044257 | Rotary actuator and method for forming a rotary piston | — | 1991-09-03 |
| 5007330 | Rotary actuator and seal assembly for use therein | Robert A. Frenzel | 1991-04-16 |
| 4967779 | Method of installing a valve seat in a valve body | — | 1990-11-06 |
| 4846441 | Methods and apparatus for adjusting a valve closure member | Douglas G. Calvin | 1989-07-11 |
| 4846212 | Bleed valve assembly for double block and bleed system | Daniel P. Kusmer | 1989-07-11 |
| 4846225 | Transmission assembly for use with double block and bleed system | Daniel P. Kusmer | 1989-07-11 |
| 4828221 | Valve assembly | Paul A. Yohner | 1989-05-09 |
| 4817213 | Method for forming a torus and a piston made therefrom for use in a rotary actuator | — | 1989-04-04 |
| 4685611 | Butterfly valve construction having a composite seat | Paul A. Yohner | 1987-08-11 |
| 4682758 | Disk/stem connection apparatus for butterfly valve | Michael L. Wagberg | 1987-07-28 |
| 4659064 | Apparatus for fixing the position of a valve element shaft in a bore | Dick R. Dodds | 1987-04-21 |
| 4651763 | Fire-safe ventilation valve | Michael L. Wagberg | 1987-03-24 |
| 4649949 | Fireproof valve assembly and seal element for use therein | Michael L. Wagberg | 1987-03-17 |
| 4648418 | Fireproof valve assembly and valve element for use therein | Michael L. Wagberg | 1987-03-10 |
| 4505290 | Valve seat assembly and valve | — | 1985-03-19 |
| 4496135 | Alignment maintaining apparatus for trunnion mounted valves | — | 1985-01-29 |
| 4457490 | High temperature valve and seat therefor | — | 1984-07-03 |
| 4411438 | Packing gland | — | 1983-10-25 |
| 4410163 | Valve seat | Edward G. Holtgraver | 1983-10-18 |