Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7245728 | Microphone for hearing aid and communications applications having switchable polar and frequency response characteristics | Mead C. Killion, Robert B. Schulein, Viorel Drambarean | 2007-07-17 |
| 7164776 | Vibration balanced receiver | Thomas E. Miller, August F. Mostardo, David E. Schafer | 2007-01-16 |
| 6876749 | Microphone for hearing aid and communications applications having switchable polar and frequency response characteristics | Mead C. Killion, Robert B. Schulein, Viorel Drambarean | 2005-04-05 |
| 6694034 | Transmission detection and switch system for hearing improvement applications | Stephen D. Julstrom, Norman P. Matzen, Robert B. Schulein, Willem Soede | 2004-02-17 |
| 6654477 | Receiver and method of construction | Thomas E. Miller | 2003-11-25 |
| 6307944 | System for mitigating RF interference in a hearing aid | Reginald G. Garratt | 2001-10-23 |
| 5335286 | Electret assembly | William J. Ballad | 1994-08-02 |
| 5101435 | Combined microphone and magnetic induction pickup system | — | 1992-03-31 |
| 5068901 | Dual outlet passage hearing aid transducer | — | 1991-11-26 |
| RE33718 | Acoustic transducer with improved electrode spacing | Peter L. Madaffari | 1991-10-15 |
| 4956868 | Magnetically shielded electromagnetic acoustic transducer | — | 1990-09-11 |
| 4867267 | Hearing aid transducer | — | 1989-09-19 |
| 4807612 | Passive ear protector | — | 1989-02-28 |
| 4800982 | Cleanable in-the-ear electroacoustic transducer | — | 1989-01-31 |
| 4730283 | Acoustic transducer with improved electrode spacing | Peter L. Madaffari | 1988-03-08 |
| 4509193 | Miniature acoustical transducer with filter/regulator power supply circuit | — | 1985-04-02 |
| 4272654 | Acoustic transducer of improved construction | — | 1981-06-09 |