Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6026156 | Enhanced call waiting | Frederick A. Epler, Robert M. Fuller, Daniel R. Kranzler | 2000-02-15 |
| 5825867 | Enhanced call waiting | Frederick A. Epler, Robert M. Fuller, Daniel R. Kranzler | 1998-10-20 |