Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881226 | Digital interface of an integrated subscriber line interface circuit | Hans-Werner Rudolf, 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 | Hans-Werner Rudolf, Harald Stader, Norbert Wingerath | 1989-08-15 |
| 4852159 | Circuit arrangement for a module in the exchange of a digital TDM telecommunications network | Manfred Drescher | 1989-07-25 |
| 4809258 | Circuit arrangement for the indication of loop closure during the ringing condition | Norbert Wingerath | 1989-02-28 |