Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5818916 | Method and apparatus for preventing return dial tone fraud in a cellular paystation | Allen W. Vogl, Thomas D. Young, Steven E. Betts | 1998-10-06 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5818916 | Method and apparatus for preventing return dial tone fraud in a cellular paystation | Allen W. Vogl, Thomas D. Young, Steven E. Betts | 1998-10-06 |