Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10390129 | Acoustic device | Roman N. Litovsky, Bojan Rip, Joseph M. Geiger, Chester Smith Williams, Pelham Norville | 2019-08-20 |
| 9913012 | Acoustic device with curved passive radiators | Chester Smith Williams, Roman N. Litovsky | 2018-03-06 |
| 9877103 | Acoustic device | Roman N. Litovsky, Bojan Rip, Joseph M. Geiger, Chester Smith Williams, Pelham Norville | 2018-01-23 |
| 8175279 | Integrated vehicle audio system | Nachiketa Tiwari, George Nichols, Christopher Ludwig | 2012-05-08 |
| 7483539 | Automobile audio system | Michael Stark, Hiroshi Miyazaki, Christopher Ludwig, Douglas J. Holmi, Seiji Kawakami +2 more | 2009-01-27 |
| 5040221 | Compact electroacoustical transducing with flat conducting tinsel leads crimped to voice coil ends | Robert A. Edwards, John A. Larson | 1991-08-13 |
| 4737992 | Compact electroacoustical transducer with spider covering rear basket opening | Ernest Latham-Brown, Rakesh C. Pandey, Robert D. White | 1988-04-12 |