Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4523307 | Power line carrier multi telephone extension system for full duplex conferencing and intercom between telephones | William M. Brown | 1985-06-11 |
| 4514594 | Power line carrier telephone extension system for full duplex conferencing between telephones and having telephone call hold capability | William M. Brown | 1985-04-30 |