Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7764801 | Directional microphone array system | Robert B. Schulein, Norman P. Matzen, Roland Horsten | 2010-07-27 |
| 7522740 | Multi-coil coupling system for hearing aid applications | Stephen D. Julstrom, Viorel Drambarean | 2009-04-21 |
| 7460677 | Directional microphone array system | Robert B. Schulein, Norman P. Matzen, Roland Horsten | 2008-12-02 |
| 7099486 | Multi-coil coupling system for hearing aid applications | Stephen D. Julstrom, Viorel Drambarean | 2006-08-29 |
| 6694034 | Transmission detection and switch system for hearing improvement applications | Stephen D. Julstrom, Elmer V. Carlson, Norman P. Matzen, Robert B. Schulein | 2004-02-17 |