Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5555554 | Vented headset speaker | Walter O. Stanton | 1996-09-10 |
| 5345509 | Transducer with ear canal pickup | Peter Untersander | 1994-09-06 |
| 5163093 | Microphone mounting for a person's neck | Frank Frielingsdorf, Peter Untersander | 1992-11-10 |
| 5054079 | Bone conduction microphone with mounting means | Frank Frielingsdorf, Peter Untersander | 1991-10-01 |
| 4949806 | Headset for underwater use | — | 1990-08-21 |
| 4843628 | Inertial microphone/receiver with extended frequency response | — | 1989-06-27 |
| 4509159 | Aluminum-aluminum oxide stylus arm | George Alexandrovich, Sr., J. Raymond Edinger, John Kuykendall | 1985-04-02 |
| D278147 | Phonograph cartridge | John Kuykendall, Frank Frielingsdorf | 1985-03-26 |
| 4498188 | Electronic stethoscope for monitoring the operation of a prosthetic valve implanted in a patient's heart | — | 1985-02-05 |
| 4413253 | Miniature sounder with double tuned cavity | Frank M. Yama | 1983-11-01 |
| 4409588 | Miniature sounder with multi-part tuned cavities | Frank M. Yama | 1983-10-11 |
| D266244 | Collapsible headset | Frank Frielingsdorf | 1982-09-21 |
| 4315112 | Speaker | — | 1982-02-09 |
| 4251807 | Miniature buzzer | Frank M. Yama | 1981-02-17 |