Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4553627 | Hearing aid wax guard | Rolf Dohmer | 1985-11-19 |
| 4349082 | Acoustical damping element and method of forming same | — | 1982-09-14 |
| 4193647 | Piezoelectric ceramic transducers with uniform resonant frequency | Joe F. Guess | 1980-03-18 |