Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7668720 | Methodology for voice enabling applications | David Seifert, William Sherman, III | 2010-02-23 |
| 5163110 | Pitch control in artificial speech | Richard P. Sprague | 1992-11-10 |
| 5140639 | Speech generation using variable frequency oscillators | Richard P. Sprague | 1992-08-18 |
| 5029213 | Speech production by unconverted digital signals | Kevin Kachikian, Richard P. Sprague | 1991-07-02 |