Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4833391 | Method and apparatus for charging lead-acid-accumulators | — | 1989-05-23 |
| 4547842 | Electrical shock prevention means for high voltage DC regulators | Hans M. Beierholm | 1985-10-15 |