Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5027052 | Circuit arrangement for generating a pulsatory supply voltage for a load from a direct voltage | Heinz Helmus, Heinz B. Merker | 1991-06-25 |
| 4808885 | Electric incandescent lamp for series arrangement having an electrically conductive vitreous body connecting oxide coated current-supply conductors | Rolf Gervelmeyer, Heinrich B. Merker | 1989-02-28 |