Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6895345 | Portable hearing-related analysis system | Jeffrey C. Erdahl, David A. Preves | 2005-05-17 |
| 6647345 | Portable hearing-related analysis system | Jeffrey C. Erdahl, David A. Preves | 2003-11-11 |
| 6366863 | Portable hearing-related analysis system | Jeffrey C. Erdahl, David A. Preves | 2002-04-02 |