| 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 |