Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871911 | Electron beam apparatus comprising a semiconductor electron emitter | Arthur M. E. Hoeberechts, Karel Diederick Van Der Mast, Harm Tolner | 1989-10-03 |
| 4853585 | Display device with multiplicity of closely spaced electron beams | Arthur M. E. Hoeberechts | 1989-08-01 |
| 4853754 | Semiconductor device having cold cathode | Henri F. J. van 't Blik | 1989-08-01 |
| 4801994 | Semiconductor electron-current generating device having improved cathode efficiency | Arthur M. E. Hoeberechts | 1989-01-31 |