Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7957540 | Automobile audio system | Christopher Ludwig, Hal P. Greenberger, Hiroshi Miyazaki | 2011-06-07 |
| 7724909 | Automobile audio system | Christopher Ludwig, Hal P. Greenberger | 2010-05-25 |
| 7483539 | Automobile audio system | Hiroshi Miyazaki, Christopher Ludwig, Douglas J. Holmi, Seiji Kawakami, Brandon Westley +2 more | 2009-01-27 |