Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5657254 | Process gas distribution system and method with automatic transducer zero calibration | Dennis A. Sierk, Ronald R. DuRoss, Stephen G. Geist | 1997-08-12 |
| 5508947 | Process gas distribution system and method with automatic transducer zero calibration | Dennis A. Sierk, Ronald R. DuRoss, Stephen G. Geist | 1996-04-16 |
| 5497316 | Process gas distribution system and method | Dennis A. Sierk, Ronald R. DuRoss, Stephen G. Geist | 1996-03-05 |
| 5220517 | Process gas distribution system and method with supervisory control | Dennis A. Sierk, Ronald R. DuRoss, Stephen G. Geist | 1993-06-15 |