Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8139740 | Method for operating a telephone system with at least two telephony terminals and a telephony terminal for carrying out the method | Michael Grun, Stephan Wuermlin Stadler, James Farber, Steven Greenspan | 2012-03-20 |