Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5642428 | Method and apparatus for determining playback volume in a messaging system | — | 1997-06-24 |
| 5493609 | Telecommunication system for automatic switching between voice and data communications | Michael M. Winseck, Jr., Richard A. Davis | 1996-02-20 |
| 5444770 | Telephone handset interface for automatic switching between voice and data communications | Richard A. Davis, Kenneth L. Frick, Gregory Muir | 1995-08-22 |