| 10939217 |
Audio device with acoustic valve |
Christopher Monti, Shehab Albahri, Erik Wiederholtz, Charles King, Christopher A. Jones +2 more |
2021-03-02 |
| 9451349 |
Earphone assembly with moisture resistance |
William J. Ballad, Ying-Tzu Chan, Mei-Yu Lin, Jen Nan Feng |
2016-09-20 |
| 9078064 |
Earphone assembly with moisture resistance |
William J. Ballad, Ying-Tzu Chan, Mei-Yu Lin, Jen Nan Feng |
2015-07-07 |
| 8879767 |
Acoustic apparatus and method of manufacturing |
— |
2014-11-04 |
| 8532323 |
Earphone assembly with moisture resistance |
William J. Ballad, Mei-Yu Lin, Ying-Tzu Chan, Jen Nan Feng |
2013-09-10 |
| 7477756 |
Isolating deep canal fitting earphone |
William J. Ballad, David Schaefer |
2009-01-13 |
| 5692060 |
Unidirectional microphone |
— |
1997-11-25 |
| 5408534 |
Electret microphone assembly, and method of manufacturer |
Ernest L. Lenzini |
1995-04-18 |