Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6541899 | Discharged lamp with multiple electron emissive electrode bodies | Marco Haverlag, John Fitzgerald, Andreas S. G. Geven | 2003-04-01 |
| 6137225 | Low-pressure discharge lamp with filament having protective coating | Andreas S. G. Geven | 2000-10-24 |
| 5990626 | Lighting unit, low-pressure mercury discharge lamp, supply unit, and combined packaging | Abraham L. De Smit | 1999-11-23 |
| 5841222 | Low-pressure discharge lamp | Hui-Meng Chow | 1998-11-24 |
| 5233268 | Low-pressure mercury vapor discharge lamp | Franciscus A. S. Ligthart | 1993-08-03 |
| 4727283 | Low-pressure mercury vapour discharge lamp | Johannes Trudo Cornelis Van Kemenade, Gerardus H. M. Siebers, Johannes T. W. deHair, Johannes W. ter Vrugt | 1988-02-23 |
| 4546285 | Low-pressure mercury vapor discharge lamp | Winston Donald Couwenberg, Franciscus A. S. Ligthart | 1985-10-08 |
| 4277720 | Low-pressure mercury vapor discharge lamp | Winston Donald Couwenberg, Albert Bouwknegt, Franciscus A. S. Ligthart | 1981-07-07 |