Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5742114 | Lamp envelope with a metal clamping member and a fixation member | Ralf Schafer, Manfred Westemeyer, Cornelis Johannes Janson | 1998-04-21 |
| 5654608 | Capped electric lamp | Manfred Westemeyer, Ralf Schafer | 1997-08-05 |