| 6752171 |
Control-valve drive with sensor unit for detecting the position of the valve |
Stefan Kolbenschlag, Walter Schneider |
2004-06-22 |
| 6294732 |
Field device of the pressure-resistant encapsulation type of protection |
Heinfried Hoffmann |
2001-09-25 |
| 6295511 |
Apparatus for controlling and monitoring actuators with an open/close characteristic |
— |
2001-09-25 |
| 6119515 |
Method and apparatus for monitoring actuators |
Peter Opl |
2000-09-19 |
| 6050296 |
Control apparatus |
Heinfried Hoffmann, Joerg Kiesbauer |
2000-04-18 |
| 5699824 |
Electrical-pneumatic system |
Stefan Kolbenschlag |
1997-12-23 |
| 5452742 |
Electropneumatic position controller |
Fausto Crespo Vidal, Heinfried Hoffmann |
1995-09-26 |
| 5404744 |
Position controller |
Heinfried Hoffmann, Bernd Mann |
1995-04-11 |
| 4925498 |
Pneumatic control valve |
— |
1990-05-15 |
| 4922952 |
Pneumatic control valve |
— |
1990-05-08 |
| 4794841 |
Pneumatic drive mechanism for positioning apparatus |
Norbert Jeschke |
1989-01-03 |
| 4730502 |
Apparatus for transferring mechanical motions representing measured quantities |
— |
1988-03-15 |
| 4402335 |
Damping unit for measuring and automatic control systems |
— |
1983-09-06 |
| 4343224 |
Automatic control system |
— |
1982-08-10 |