Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7711138 | Loudspeaker including a cone circumscribed by a stiffener | — | 2010-05-04 |
| 6837333 | Loudspeaker system with forced air circulation and control circuit therefor | — | 2005-01-04 |
| 6647120 | Loudspeaker protection circuit responsive to temperature of loudspeaker driver mechanism | — | 2003-11-11 |
| 6390231 | Loudspeaker with directed airflow cooling | — | 2002-05-21 |
| 4908601 | Loud speaker with horizontal radiation pattern | — | 1990-03-13 |
| D305660 | Loudspeaker | — | 1990-01-23 |
| 4390078 | Loudspeaker horn | Clifford Henrickson | 1983-06-28 |
| 4344504 | Directional loudspeaker | — | 1982-08-17 |