Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6847726 | Shorting rings in dual-coil dual-gap loudspeaker drivers | Douglas J. Button, Ralph E. Hyde | 2005-01-25 |
| 6768806 | Shorting rings in dual-coil dual-gap loudspeaker drivers | Douglas J. Button, Ralph E. Hyde | 2004-07-27 |