Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871911 | Electron beam apparatus comprising a semiconductor electron emitter | Gerardus G. P. Van Gorkom, Karel Diederick Van Der Mast, Harm Tolner | 1989-10-03 |
| 4857980 | Radiation-sensitive semiconductor device with active screening diode | — | 1989-08-15 |
| 4853585 | Display device with multiplicity of closely spaced electron beams | Gerardus G. P. Van Gorkom | 1989-08-01 |
| 4801994 | Semiconductor electron-current generating device having improved cathode efficiency | Gerardus G. P. Van Gorkom | 1989-01-31 |