Issued Patents All Time
Showing 76–98 of 98 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5966639 | System and method for enhancing speech intelligibility utilizing wireless communication | Jack Goldberg, James R. Hendershot | 1999-10-12 |
| 5878147 | Directional microphone assembly | Jonathan K. Stewart, Don Wilson, Matthew Roberts, Steve Iseberg, Timothy S. Monroe | 1999-03-02 |
| 5812679 | Electronic damper circuit for a hearing aid and a method of using the same | Chris W. Papalias, Anthony J. Becker | 1998-09-22 |
| 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 |
| 5577511 | Occlusion meter and associated method for measuring the occlusion of an occluding object in the ear canal of a subject | — | 1996-11-26 |
| 5524056 | Hearing aid having plural microphones and a microphone switching system | Fred Waldhauer, Johannes Wittkowski, Richard Goode, Jont B. Allen | 1996-06-04 |
| 5144675 | Variable recovery time circuit for use with wide dynamic range automatic gain control for hearing aid | Harry Teder, Arthur C. W. Johnson, Steven P. Hanke | 1992-09-01 |
| 5131046 | High fidelity hearing aid amplifier | Norman P. Matzen, Clyde M. Brown, Jr., William A. Cole, James B. Compton, Steven J. Iseberg +2 more | 1992-07-14 |
| 5128566 | Variable attenuator circuit | Donald L. Wilson | 1992-07-07 |
| 5113967 | Audibility earplug | Jonathan K. Stewart, Robert N. Falco, Elliott H. Berger | 1992-05-19 |
| 5099856 | Electrode isolation amplifier | Donald L. Wilson, Jonathan K. Stewart | 1992-03-31 |
| 4852683 | Earplug with improved audibility | — | 1989-08-01 |
| 4781196 | Conductive eartip assembly | — | 1988-11-01 |
| 4763753 | Insert earphones for audiometry | — | 1988-08-16 |
| 4689819 | Class D hearing aid amplifier | — | 1987-08-25 |
| 4677679 | Insert earphones for audiometry | — | 1987-06-30 |
| 4677675 | Response-modifying acoustic couplers for hearing aids | Donald L. Wilson | 1987-06-30 |
| 4592087 | Class D hearing aid amplifier | — | 1986-05-27 |
| 4450930 | Microphone with stepped response | — | 1984-05-29 |