Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5307403 | Telephone branch line transmission circuit with blocking capacitor | — | 1994-04-26 |
| 5247573 | Telecommunications system comprising a circuit arrangement for at least one subscriber station | — | 1993-09-21 |
| 5121425 | Telephone transmission circuit with improved switching device | — | 1992-06-09 |
| 4485351 | Circuit for deriving of signals and counter cycle signals from one sided input signal | Hans-Robert Schemmel | 1984-11-27 |