Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5805635 | Secure communication system | Daniel E. Andrews, Robert D. Isaak | 1998-09-08 |
| 5493612 | Secure communication keying system | Woodrow H. Littrell, Robert D. Isaak, Richard G. Stephenson | 1996-02-20 |
| 4207625 | Doppler compensator for heterodyne correlation devices | Woodrow H. Littrell, Robert D. Isaak | 1980-06-10 |
| 4203164 | Secure sonar communication system | Robert D. Isaak, Woodrow H. Littrell, Richard G. Stephenson | 1980-05-13 |