Issued Patents All Time
Showing 26–47 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6934402 | Planar-magnetic speakers with secondary magnetic structure | David Graebener | 2005-08-23 |
| 6925187 | Horn array emitter | Elwood G. Norris | 2005-08-02 |
| 6850623 | Parametric loudspeaker with improved phase characteristics | Elwood G. Norris, Joseph O. Norris | 2005-02-01 |
| 6760455 | Electrostatic loudspeaker with a distributed filter | Robert C. Williamson | 2004-07-06 |
| 6704426 | Loudspeaker system | — | 2004-03-09 |
| 6700217 | Apparatus for converting ocean wave motion to electricity | Vaughn W. North, Kenneth L. DeVries | 2004-03-02 |
| 6628791 | Signal derived bias supply for electrostatic loudspeakers | Jeevan G. Bank | 2003-09-30 |
| 6584205 | Modulator processing for a parametric speaker system | Michael E. Spencer, Joseph O. Norris | 2003-06-24 |
| 6577738 | Parametric virtual speaker and surround-sound system | Elwood G. Norris | 2003-06-10 |
| 6535612 | Electroacoustic transducer with diaphragm securing structure and method | Terry J. Conrad | 2003-03-18 |
| 6393129 | Paper structures for speaker transducers | Terry J. Conrad, Elwood G. Norris | 2002-05-21 |
| 6389146 | Acoustically asymmetric bandpass loudspeaker with multiple acoustic filters | — | 2002-05-14 |
| 6304662 | Sonic emitter with foam stator | Elwood G. Norris | 2001-10-16 |
| 6229899 | Method and device for developing a virtual speaker distant from the sound source | Elwood G. Norris | 2001-05-08 |
| 6201874 | Electrostatic transducer with nonplanar configured diaphragm | Elwood G. Norris | 2001-03-13 |
| 6188772 | Electrostatic speaker with foam stator | Elwood G. Norris | 2001-02-13 |
| 6175636 | Electrostatic speaker with moveable diaphragm edges | Elwood G. Norris | 2001-01-16 |
| 6169811 | Bandpass loudspeaker system | — | 2001-01-02 |
| 5748759 | Loud speaker structure | Robert C. Williamson | 1998-05-05 |
| 5396194 | Audio frequency power amplifiers | Robert C. Williamson | 1995-03-07 |
| 5109416 | Dipole speaker for producing ambience sound | — | 1992-04-28 |
| 4803733 | Loudspeaker diaphragm mounting system and method | Robert W. Carver | 1989-02-07 |