Issued Patents All Time
Showing 51–60 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831259 | Pyrodetector suited for movement-selective and direction-selective detection | Gerhard Mader, Reinhard Freitag | 1989-05-16 |
| 4778770 | Process for making sensor elements in a retaining frame for a pyrodetector | Reinhard Freitag, Felix Pettke, Hans Siwon, Ulrich Armonier | 1988-10-18 |
| 4751388 | Sensor element in a retaining frame for a pyrodetector and method for the manufacture thereof | Reinhard Freitag, Felix Pettke, Hans Siwon, Ulrich Armonier | 1988-06-14 |
| 4716294 | Pyrodetector for the detection of a body entering into its detection area | Felix Pettke, Hans Siwon | 1987-12-29 |
| 4423347 | Positioning element with a piezo-ceramic body | Peter Kleinschmidt, Valentin Magori | 1983-12-27 |
| 4371778 | Electric heating device employing PTC heating element for preheating of heating oil | Andreas Schebler | 1983-02-01 |
| 4331861 | Positive temperature coefficient (PTC) resistor heating device | — | 1982-05-25 |
| 4292499 | Electronic calcification indicator for flow heaters heated by PTC resistors | Peter Kleinschmidt, Valentin Magori | 1981-09-29 |
| 4230935 | Immersion heater | — | 1980-10-28 |
| 4223208 | Heater with a ferro-electric ceramic heating element | Peter Kleinschmidt | 1980-09-16 |