Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8023688 | Ultra low frequency transducer and loud speaker comprising same | William O. Doerring | 2011-09-20 |
| 7916890 | Ultra low frequency transducer and loud speaker comprising same | William O. Doering | 2011-03-29 |