Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6208069 | Low-pressure mercury discharge lamp for tanning | Thomas Justel, Hans Nikol, Cornelis Reinder Ronda, Cornelis Jojakim Jalink | 2001-03-27 |
| 6144152 | Luminescent screen for low pressure mercury discharge lamp with specific emission range | — | 2000-11-07 |
| 6060831 | Discharge lamp with specific fill and luminescent layers | Christianus J. Roozekrans, Franciscus A. S. Ligthart | 2000-05-09 |
| 5994831 | Low-pressure mercury discharge lamp with luminescent layer | Henricus C. G. Verhaar, Jan Willem Frederik Dorleijn | 1999-11-30 |
| 5825125 | Neon discharge lamp | Franciscus A. S. Ligthart, Rolf De Man, Christianus J. Roozekrans | 1998-10-20 |