Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871911 | Electron beam apparatus comprising a semiconductor electron emitter | Gerardus G. P. Van Gorkom, Arthur M. E. Hoeberechts, Karel Diederick Van Der Mast | 1989-10-03 |
| 4798957 | Electron beam apparatus comprising an anode which is included in the cathode/Wehnelt unit | — | 1989-01-17 |