Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4797926 | Digital speech vocoder | Walter T. Hartwell, Willem Baastian Kleijn, Dimitrios P. Prezas | 1989-01-10 |
| 4771465 | Digital speech sinusoidal vocoder with transmission of only subset of harmonics | Walter T. Hartwell, Thomas E. Jacobs, Richard Harry Ketchum, Willem Baastian Kleijn | 1988-09-13 |