Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887299 | Adaptive, programmable signal processing hearing aid | Kenneth L. Cummins, Malcolm J. Williamson | 1989-12-12 |
| 4813430 | Microphonic probe tube mounting for real ear measurements | Paul Schmitt | 1989-03-21 |