Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7702120 | Self-amplified loudspeakers with switching amplifier technology | — | 2010-04-20 |
| D531164 | Self-amplified loudspeaker | Thomas Nelson, Berta Grushko | 2006-10-31 |
| 6388906 | Backslope regulator system | — | 2002-05-14 |