Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6845152 | System and method to stop call looping | Hans Nordin | 2005-01-18 |
| 6584317 | Concurrent ringing on multiple network telephones | Sandip Mukerjee, Richard Zaffino | 2003-06-24 |
| 6405041 | Concurrent ringing on multiple network telephones | Sandip Mukerjee, Richard Zaffino | 2002-06-11 |
| 4782508 | Method of discouraging the completion of wrong-number calls | James W. Borchering | 1988-11-01 |
| 4723273 | Discretionary call forwarding | Michael E. Diesel | 1988-02-02 |