Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6580797 | Amplifier circuit for electret microphone with enhanced performance | David J. Truesdell | 2003-06-17 |
| 6504937 | Amplifier circuit for electret microphone with enhanced performance | David J. Truesdell | 2003-01-07 |