Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 | Johannus G. Verlijsdonk, Joseph Rutten | 1989-03-07 |