Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881226 | Digital interface of an integrated subscriber line interface circuit | Robert Lechner, Harald Stader, Norbert Wingerath, Christopher C. A. Priest, Nigel P. Dyer +7 more | 1989-11-14 |
| 4858226 | Method for the operation of an interface circuit between a central portion and local portions of a subscriber termination module of a digital time multiplex telecommunications network | Harald Stader, Norbert Wingerath, Robert Lechner | 1989-08-15 |