Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10277183 | Volume-dependent automatic gain control | — | 2019-04-30 |
| 5960393 | User selectable multiple threshold criteria for voice recognition | Mitra P. Deldar, Donald Marion Keen, Ellen Anne Keen | 1999-09-28 |
| 5930751 | Method of implicit confirmation for automatic speech recognition | John A. Karpicke, Donald Marion Keen, Barry L. Lively | 1999-07-27 |
| 5842161 | Telecommunications instrument employing variable criteria speech recognition | Mitra P. Deldar, Donald Marion Keen, Ellen Anne Keen | 1998-11-24 |
| 5687227 | Telephone with user recorded ringing signal | Donald Marion Keen | 1997-11-11 |