Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6405051 | Method and apparatus for using a B-answer signal to prevent a voice announcement in a group call | Lars Gunnar Folke Ahlström | 2002-06-11 |
| 6366652 | Method and apparatus for using a VM tone to prevent a voice announcement in a group call | Lars Gunnar Folke Ahlström | 2002-04-02 |
| 6154645 | Method and apparatus for using a MS tone to prevent a voice announcement in a group call | Lars Gunnar Folke Ahlström | 2000-11-28 |