Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6815889 | High-pressure gas discharge lamp | Michael Haacke, Pieter Postma, Paul Hellwig, Ralf Muckel | 2004-11-09 |
| 6812625 | Discharge lamp and outer bulb therefor | Marcus Kubon, Paul Hellwig | 2004-11-02 |