Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9049501 | Audio system with synthesized positive impedance | Kenneth B. Delpapa, Michael B. Nussbaum, George Nichols, Thomas A. Froeschle | 2015-06-02 |
| 8224009 | Audio system with synthesized positive impedance | Kenneth B. Delpapa, Michael B. Nussbaum, George Nichols, Thomas A. Froeschle | 2012-07-17 |