Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6839555 | Method and apparatus for supporting voice message services with automatic rebound in a wireless intelligent network | Langdon Edward Alger, Robert Thomas Calabrese, Tracy Edwin III East, John Mitchell Rendak | 2005-01-04 |
| 6389279 | Method and apparatus providing call redirection for subsequent call events in a telephone communications system | Robert Thomas Calabrese, Robin Jeffrey Thompson, Jeffrey Arthur Zahnle | 2002-05-14 |