Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7672461 | Method and apparatus for creating a virtual third channel in a two-channel amplifier | Emmett E. Heath | 2010-03-02 |
| 7251333 | Method and apparatus for creating a virtual third channel in a two-channel amplifier | Emmett E. Heath | 2007-07-31 |
| 6549637 | Loudspeaker with differential flow vent means | — | 2003-04-15 |
| 5586194 | Augmentation amplifier | — | 1996-12-17 |
| 4452480 | Record handling device | Bruce R. Maier | 1984-06-05 |