Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868455 | Electron beam device with an electron gun having a tubular insulating electrode support | — | 1989-09-19 |
| 4857797 | Cathode ray tube having a tubular electron gun structure | Tjerk G. Spanjer | 1989-08-15 |
| 4853589 | Electron beam device having an electron gun and a method of making the electron gun | — | 1989-08-01 |
| 4827184 | Electron beam device and a focusing lens therefor | Tjerk G. Spanjer | 1989-05-02 |