Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5029217 | Digital hearing enhancement apparatus | Douglas M. Chabries, Robert Brey, Richard W. Christiansen, Gary Robert Kenworthy | 1991-07-02 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5029217 | Digital hearing enhancement apparatus | Douglas M. Chabries, Robert Brey, Richard W. Christiansen, Gary Robert Kenworthy | 1991-07-02 |