Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7136498 | Loudspeaker having a dual chamber acoustical enclosure with two external vents and one internal vent | — | 2006-11-14 |
| 6665408 | Dynamic bass control circuit with variable cut-off frequency | — | 2003-12-16 |
| 6470088 | Vented loudspeaker enclosure with limited driver radiation | — | 2002-10-22 |
| 6297695 | High volume expander circuit | — | 2001-10-02 |
| 6172561 | High volume expander circuit | — | 2001-01-09 |
| 5912975 | Method and circuit for creating phantom sources using phase shifting circuitry | — | 1999-06-15 |
| 5892831 | Method and circuit for creating an expanded stereo image using phase shifting circuitry | — | 1999-04-06 |
| 5761313 | Circuit for improving the stereo image separation of a stereo signal | — | 1998-06-02 |
| 5692051 | Electronic equalization for recessed loudspeaker mounting | — | 1997-11-25 |
| 4445227 | Loudspeaker having improved directional characteristics | David N. Leiendecker | 1984-04-24 |