Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4481662 | Method and apparatus for operating a loudspeaker below resonant frequency | Ronald J. Wickersham | 1984-11-06 |
| 4361736 | Pressure recording process and device | Ronald J. Wickersham | 1982-11-30 |