Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10458953 | Method and system for acquiring natural frequency of diaphragm | Chao Jiang | 2019-10-29 |
| 10197438 | Device and method for testing impedance characteristic and expansion performance of sound absorption material | Xiaodong Cao | 2019-02-05 |