Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854956 | Method of manufacturing optical fibres having a core and a cladding of glass applying the rod-in-tube technique | Rene A. M. Pluijms, Leendert B. Jongeling, Johannes van Esdonk | 1989-08-08 |
| 4814105 | Method of preparing a luminescent quartz glass activated by bivalent europium, luminescent quartz glass obtained by such a method and luminescent screen provided with such a luminescent quartz glass | Gerrit Oversluizen, Gijsbertus A. C. M. Spierings | 1989-03-21 |
| 4804422 | Method of purifying quartz sand | Leonard T. M. Ebben | 1989-02-14 |