Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4595796 | Method of and a circuit arrangement for determining current criteria in the lines of a telephone system | Jorg Robra | 1986-06-17 |
| 4525602 | Method of and a circuit for energizing a subscriber's circuit in a telephone system | Joerg Robra | 1985-06-25 |