Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5256934 | Display tube comprising an electron gun with a resistive focusing lens | Jeroen Van Engelshoven, Ger-Wim J. Goorhuis, Gerardus A. H. M. Vrijssen, Tjerk G. Spanjer | 1993-10-26 |
| 4961022 | Display tube including a helical focusing lens with a non-rotationally symmetrical lens element | Antonius W. F. van der Heijden, Erich E. Himmelbauer, 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, Erich E. Himmelbauer, Tjerk G. Spanjer, Gerardus A. H. M. Vrijssen | 1990-07-31 |