Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5021636 | Electrical cooking unit and electrical cooking apparatus provided with this unit | — | 1991-06-04 |
| 4645967 | Electrodeless low-pressure gas discharge lamp | Heiner Kostlin, Wiggert Kroontje | 1987-02-24 |
| 4642520 | High pressure discharge lamp | Eise B. Geertsema | 1987-02-10 |
| 4380714 | High-pressure discharge lamp | Eise B. Geertsema | 1983-04-19 |