Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5138650 | Cordless telephone with internal debit and credit memory | David L. Brown, David R. Heeschen, Robert L. Breeden, Richard E. Bessom, Frank E. Lambrcht +1 more | 1992-08-11 |
| 4947420 | Communication system | David J. Michalak, Klaus Knapp | 1990-08-07 |
| 4630035 | Alarm system having alarm transmitter indentification codes and acoustic ranging | Burton J. Fischel, Frank Will | 1986-12-16 |