Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837481 | Cerium and terbium activated luminescent material and mercury vapor discharge lamp containing the same | Judicus M. P. J. Verstegen, Emiel P. J. de Meester, Willebrordus H. M. M. Van de Spijker, Johannes G. Verriet | 1989-06-06 |
| 4827187 | Luminescent barium-hexa-aluminate, luminescent screen provided with such an aluminate and low-pressure mercury vapor discharge lamp provided with such a screen | — | 1989-05-02 |
| 4810930 | Luminescent Eu.sup.3+ -activated silicate, luminescent screen provided with such a silicate and low-pressure mercury vapor discharge lamp provided with such a screen | Bruno M. J. Smets, Joseph Rutten | 1989-03-07 |