Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8373743 | System and method for playing back individual conference callers | — | 2013-02-12 |
| 5521903 | Port system for interfacing digital PBX to digital transmission facility | Michael J. English, David M. Kissel, Douglas A. Spencer, Jeffrey A. Williams, Jerome J. Zelenski | 1996-05-28 |
| 5195090 | Wireless access telephone-to-telephone network interface architecture | Brian D. Bolliger, Talmage P. Bursh, Jr., Marc K. Dennison, Michael J. English, Charles Y. Farwell +14 more | 1993-03-16 |
| 5195091 | Adaptive synchronization arrangement | Charles Y. Farwell, Richard M. Heidebrecht, Kelvin Ho, Douglas A. Spencer | 1993-03-16 |
| 5184347 | Adaptive synchronization arrangement | Charles Y. Farwell, Richard M. Heidebrecht, Kelvin Ho, Douglas A. Spencer | 1993-02-02 |