Issued Patents All Time
Showing 76–79 of 79 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5734710 | Communication system having a service feature which can be activated and/or deactivated | Hans-Dietmar Schulz | 1998-03-31 |
| 5416838 | Telephone receiver with adjustable support for base and handset | Ullrich Liebing, Jurgen Hoflinger, Wilhelm Wekerle | 1995-05-16 |
| 4769835 | Method of and circuit arrangement for inserting dialling intervals between stored dialling digits | Werner Frerichs, Hubert Grucza | 1988-09-06 |
| 4723275 | Circuit arrangement for generating an acoustic ringing signal in a subscriber telephone set | Werner Frerichs, Hubert Grucza | 1988-02-02 |