Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882751 | Secure trunked communications system | Kenneth J. Zdunek, Eric F. Ziolko | 1989-11-21 |
| 4860312 | Quality improvement for a digitally transmitted information signal | Anthony P. van den Heuvel, Kenneth J. Crisler | 1989-08-22 |
| 4839923 | Method and apparatus for time companding an analog signal | — | 1989-06-13 |