Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6574333 | State machine based universal voice grade cards | E. Barton Manchester | 2003-06-03 |
| 6078593 | Method and apparatus for reliable operation of universal voice grade cards | Thomas R. Eames, Lac X. Trinh, E. Barton Manchester, David J. Manley, Scott T. Hicks +2 more | 2000-06-20 |