Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8462771 | Method for changing between a packet-oriented PTT session and a circuit-oriented telephone connection between at least two radio communication appliances, associated radio communication appliance, network component and radio communication system | Josef Laumen, Norbert Schwagmann | 2013-06-11 |
| 7522584 | Method for changing between a packet-oriented PTT session and a circuit-oriented telephone connection between at least two radio communication appliances, associated radio communication appliance, network component and radio communication system | Josef Laumen, Norbert Schwagmann | 2009-04-21 |
| 7203509 | Method for managing communication sessions | Thomas Gottschalk, Eric Hilf | 2007-04-10 |