Issued Patents 1997
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699435 | Microphone probe tubing | — | 1997-12-16 |
| 5696833 | Hearing aid having externally controlled amplifier gain and method of using same | Norman P. Matzen | 1997-12-09 |
| 5661420 | Mounting configuration for monolithic integrated circuit | Jonathan K. Stewart | 1997-08-26 |
| 5623550 | Battery power supply circuit which supplies correct power polarity irrespective of battery orientation | — | 1997-04-22 |
| 5602925 | Hearing aid with programmable resistor | — | 1997-02-11 |