Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7623670 | Waveguide electroacoustical transducing | Jeffrey Hoefler, John H. Wendell, Robert Preston Parker, Thomas A. Froeschle | 2009-11-24 |
| 6771787 | Waveguide electroacoustical transducing | Jeffrey Hoefler, John H. Wendell, Robert Preston Parker, Thomas A. Froeschle | 2004-08-03 |
| 5809153 | Electroacoustical transducing | J. Richard Aylward, Timothy Holl | 1998-09-15 |
| 5418337 | Loudspeaker driver surrounding | — | 1995-05-23 |
| 5092424 | Electroacoustical transducing with at least three cascaded subchambers | Brian J. Gawronski | 1992-03-03 |
| 4932060 | Stereo electroacoustical transducing | — | 1990-06-05 |
| 4723289 | Stereo electroacoustic transducing | Christopher B. Ickler | 1988-02-02 |
| RE31679 | Loudspeaker enclosure with acoustical compliance resonating with port mass at frequency below system resonance | Thomas A. Froeschle | 1984-09-18 |