Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6563916 | System for transmitting a change in call queued/hold state across a communications network | Douglas Anthony Deutsch, David B. Smith | 2003-05-13 |
| 6219415 | Call hold state notification across a communications network | Douglas Anthony Deutsch, David B. Smith | 2001-04-17 |