Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851735 | Single-ended high-pressure discharge lamp with coil and mandrel electrode | Achim Gosslar | 1989-07-25 |
| 4801840 | Discharge lamp having automatically controlled preheating device attached to envelope | Alexander Dobrusskin, Wolfgang Schade | 1989-01-31 |