Patents per Year
Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 10939217 | Audio device with acoustic valve | Christopher Monti, Shehab Albahri, Erik Wiederholtz, Charles King, Christopher A. Jones +2 more | 2021-03-02 | $4,509,000 |
| 9451349 | Earphone assembly with moisture resistance | William J. Ballad, Ying-Tzu Chan, Mei-Yu Lin, Jen Nan Feng | 2016-09-20 | $15,853,000 |
| 9078064 | Earphone assembly with moisture resistance | William J. Ballad, Ying-Tzu Chan, Mei-Yu Lin, Jen Nan Feng | 2015-07-07 | $3,808,000 |
| 8879767 | Acoustic apparatus and method of manufacturing | — | 2014-11-04 | $12,931,000 |
| 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 |