Issued Patents All Time
Showing 26–35 of 35 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7222016 | System and method for transfer of feedback control for a process control device | Jimmie L. Snowbarger, LeDoyle Pingel | 2007-05-22 |
| 7190159 | Integral hall effect limit switch for control valve stem position sensor | Curt Galbreath, Richard J. Winkler | 2007-03-13 |
| 6971626 | Independent intelligent limit switch | — | 2005-12-06 |
| 6186167 | Emergency shutdown test system | Bruce F. Grumstrup | 2001-02-13 |
| 5974855 | Electro-pneumatic converter calibration | — | 1999-11-02 |
| 5804696 | Electro-pneumatic converter calibration | George W. Gassman | 1998-09-08 |
| 5684451 | Communication system and method | Bruce F. Grumstrup, George W. Gassman | 1997-11-04 |
| 5502999 | Electro-pneumatic converter calibration | Bruce F. Grumstrup, George W. Gassman | 1996-04-02 |
| 5451923 | Communication system and method | Bruce F. Grumstrup, George W. Gassman | 1995-09-19 |
| 5434774 | Interface apparatus for two-wire communication in process control loops | — | 1995-07-18 |