Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6611604 | Ultra low frequency transducer and loud speaker comprising same | William O. Doering | 2003-08-26 |
| D473216 | Subwoofer surround and diaphragm assembly | William O. Doering | 2003-04-15 |