Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5363104 | Jamming signal cancellation system | — | 1994-11-08 |
| 5327493 | Device for detecting tones on telephone lines | Robert L. Richmond, Richard Aydelotte, Bennet Blake | 1994-07-05 |