Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4406922 | Stereo broadcast system | Francis H. Hilbert | 1983-09-27 |
| 4338491 | Compatible AM stereophonic system | Francis H. Hilbert | 1982-07-06 |
| 4218586 | Compatible AM stereo broadcast system | Francis H. Hilbert | 1980-08-19 |
| 4192968 | Receiver for compatible AM stereo signals | Francis H. Hilbert | 1980-03-11 |
| 4185171 | Compatible single sideband system for AM stereo broadcasting | — | 1980-01-22 |
| 4184046 | Compatible single sideband system for AM stereo | — | 1980-01-15 |