Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5359158 | Ceiling-mounted loudspeaker | — | 1994-10-25 |
| 5268538 | Hemispherically wide-radiating-angle loudspeaker system | — | 1993-12-07 |
| D341592 | Ceiling-mounted loudspeaker | — | 1993-11-23 |
| 4287391 | Microphone assembly for speech recording using noise-adaptive output level control | — | 1981-09-01 |
| 4214220 | Wide range magnetically biased reed switch | — | 1980-07-22 |