Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4621261 | System for making a thermo-active device temperature dependent | Robert Hehlen | 1986-11-04 |
| 4525708 | Thermoelectric effect display device | Michel Hareng, Robert Hehlen, Serge Le Berre, Pierre Leclerc, Jean-Noel Perbet | 1985-06-25 |
| 4427997 | Control device for a display screen and display screen controlled by this device | Michel Hareng, Robert Hehlen, Serge Le Berre, Pierre Leclerc, Jean-Noel Perbet | 1984-01-24 |