Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9100753 | Acoustic transducer | — | 2015-08-04 |
| 8428297 | Acoustic transducer | — | 2013-04-23 |
| 8243978 | Transducer with variable compliance | — | 2012-08-14 |
| 7577269 | Acoustic transducer | — | 2009-08-18 |
| 7528701 | Efficiency audible alarm | — | 2009-05-05 |
| 7314065 | Irreversible plug assembly | — | 2008-01-01 |
| 6041129 | Hearing apparatus | — | 2000-03-21 |
| 5451929 | Smoke alarm and air cleaning device | Donald G. Attermeyer, Michael S. Duty | 1995-09-19 |
| 5390254 | Hearing apparatus | — | 1995-02-14 |
| 5182542 | Smoke alarm and air cleaning device | Michael S. Duty | 1993-01-26 |
| 4682490 | Impact test instrument | David A. Corelli | 1987-07-28 |
| 4637402 | Method for quantitatively measuring a hearing defect | — | 1987-01-20 |
| 4419544 | Signal processing apparatus | — | 1983-12-06 |
| 4366349 | Generalized signal processing hearing aid | — | 1982-12-28 |