Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6129336 | Ball stem seal | Steven M. Kirk | 2000-10-10 |
| 5901944 | Composite valve seal | M. R. Ramakrishnan, Steven M. Kirk | 1999-05-11 |
| 5551471 | Valve with consumable vent hole seal device | David E. Klotter, Edward Scheid, M. R. Ramakrishnan | 1996-09-03 |
| 4942897 | Remote control and remote handling accessory, especially for the hot zone of radioactive plants | Giuseppe Radovan, Klaus Blaseck, Lothar Hoffmeister, Helmut Westendorf, James W. Davidson | 1990-07-24 |
| 4617957 | Rotary plug valve | — | 1986-10-21 |
| 4610266 | Valve assembly for securing a cover to a valve body with fasteners which are free of tensile stress | — | 1986-09-09 |
| 4605036 | Valve housing with removable self-contained valving unit | Russell G. Smith | 1986-08-12 |
| 4597556 | Rotary valve operating mechanism | — | 1986-07-01 |
| 4410003 | Rotary plug valve | — | 1983-10-18 |
| 4365646 | Valve assembly | — | 1982-12-28 |