Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11738163 | Gas detector for a face mask | Briant Benson | 2023-08-29 |
| D561819 | Electronic musical instrument | — | 2008-02-12 |
| 5029213 | Speech production by unconverted digital signals | William J. Arthur, Richard P. Sprague | 1991-07-02 |
| 4849836 | Copy protection for computer discs | — | 1989-07-18 |
| 4805220 | Conversionless digital speech production | Richard P. Sprague | 1989-02-14 |