Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5013384 | Vacuum system | Willem F. Mellink, Peter Janssen, Harm Lotterman | 1991-05-07 |
| 4890031 | Semiconductor cathode with increased stability | — | 1989-12-26 |
| 4766350 | Electric circuit with transient voltage doubling for improved operation of a discharge lamp | Theo Husgen, Hubert Raets, Gerd Schiefer | 1988-08-23 |
| 4743794 | Cathode-ray tube having an ion trap | Martinus H. L. M. Van Den Broek | 1988-05-10 |
| 4736135 | Electron emission device provided with a reservoir containing material reducing the electron work function | Johannes H. A. Vasterink, Johannes van Esdonk | 1988-04-05 |
| 4717855 | Dual-cathode electron emission device | Johannes H. A. Vasterink | 1988-01-05 |