Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4684847 | Glass composition suitable for use in a fluorescent lamp, tube and lamp envelope manufactured from said glass composition, and fluorescent lamp having a lamp envelope manufactured from said glass composition | Gijsbertus A. C. M. Spierings | 1987-08-04 |
| 4666871 | Glass composition suitable for use in a fluorescent lamp, tube and lamp envelope manufactured from said glass composition, and fluorescent lamp having a lamp envelope manufactured from said glass composition | Gijsbertus A. C. M. Spierings | 1987-05-19 |
| 4361779 | Lamp having a lamp vessel made of quartz glass, quartz glass and method of preparing quartz glass | Gerardus H. A. M. van der Steen | 1982-11-30 |
| 4336048 | Method of producing doped quartz glass | Gerardus H. A. M. van der Steen | 1982-06-22 |