Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9190960 | Audio power amplifier | Hardison G. Martin | 2015-11-17 |
| PP25670 | Liriope gigantea plant named ‘Pontovia’ | — | 2015-06-30 |
| 8903099 | End of branch module system | Hardison G. Martin, John D. Johnson, William Blake Brown | 2014-12-02 |
| 7602282 | Audio system end of line load module providing a load on the audio circuit in response to a test signal | Hardison G. Martin | 2009-10-13 |
| 6804504 | Audio processing system | John D. Johnson, Patrick B. Mullaney, Brian E. Flinn | 2004-10-12 |
| 6093887 | Arrangement for high-frequency opaque shielding | Willy Bohnenberger, Gerd Haxel | 2000-07-25 |
| 5428642 | Power Amplifier | — | 1995-06-27 |
| 4571554 | Balanced amplifier device | Hardison G. Martin | 1986-02-18 |
| 4374300 | Sound mixer devices | Hardison G. Martin | 1983-02-15 |
| 4359600 | Programable low impedance digital attenuators | Hardison G. Martin | 1982-11-16 |
| 4359602 | Multiple input audio program system | Hardison G. Martin | 1982-11-16 |
| 4239938 | Multiple input signal digital attenuator for combined output | — | 1980-12-16 |