Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6897758 | Method for reproducing direct currents and a direct current transformer for carrying out said method | Henry Franke, Holger Hochgraef, Wolfgang Roehl | 2005-05-24 |
| 6617858 | Method and circuit for measuring a current | Wolfgang Rohl, Holger Hochgraef | 2003-09-09 |
| 6559648 | Method for operating an electronic overcurrent trip of a power circuit breaker | Manfred Schiller | 2003-05-06 |