Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849836 | Copy protection for computer discs | — | 1989-07-18 |
| 4805220 | Conversionless digital speech production | Richard P. Sprague | 1989-02-14 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849836 | Copy protection for computer discs | — | 1989-07-18 |
| 4805220 | Conversionless digital speech production | Richard P. Sprague | 1989-02-14 |