Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879743 | PBX and adjunct using multi-frequency tones for communication therebetween | Edmund T. Burke, Timothy M. Rubert | 1989-11-07 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879743 | PBX and adjunct using multi-frequency tones for communication therebetween | Edmund T. Burke, Timothy M. Rubert | 1989-11-07 |