Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4354139 | Low-pressure mercury vapor discharge lamp | Willem L. Konijnendijk, Petrus J. M. Willemsen | 1982-10-12 |
| 4335330 | Low-pressure mercury vapor discharge lamp | Louis E. Vrenken, Winston D. Couvbenberg, Franciscus A. S. Ligthart | 1982-06-15 |