Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4800319 | Low-pressure mercury vapor discharge lamp | Johannes Trudo Cornelis Van Kemenade, Johannes T. W. De Hair | 1989-01-24 |
| 4644223 | Low-pressure mercury vapor discharge lamp | Johannes T. W. De Hair, Johannes Trudo Cornelis Van Kemenade | 1987-02-17 |
| 4602188 | Low-pressure mercury vapor discharge lamp | Johannes T. W. De Hair, Johannes Trudo Cornelis Van Kemenade | 1986-07-22 |