Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4961022 | Display tube including a helical focusing lens with a non-rotationally symmetrical lens element | Gerardus J. A. Hellings, Antonius W. F. van der Heijden, Gerardus A. H. M. Vrijssen, Tjerk G. Spanjer, Willem M. Van Alphen +1 more | 1990-10-02 |
| 4945283 | Cathode ray tube having a tubular focus structure | Antonius W. F. van der Heijden, Gerardus J. A. Hellings, Tjerk G. Spanjer, Gerardus A. H. M. Vrijssen | 1990-07-31 |
| 4855638 | Camera tube system and electron gun therefor | — | 1989-08-08 |
| 4752715 | Television camera tube | Jacob van den Berg | 1988-06-21 |
| 4607190 | Television camera tube with conductive wall coating and transversely wall supported electrode | — | 1986-08-19 |
| 4547694 | Low-loss cathode for a television camera tube | — | 1985-10-15 |
| 4376907 | Television camera tube with diode electron gun | — | 1983-03-15 |
| 4271373 | Cathode ray tube with inclined electrostatic field lens | Joseph M. Koemans | 1981-06-02 |
| 4249215 | Televison camera comprising a pick-up tube | Willem J. Lohuis | 1981-02-03 |