Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6201872 | Active control source cancellation and active control Helmholtz resonator absorption of axial fan rotor-stator interaction noise | Bruce E. Walker, Larry A. Heidelberg, Sr. | 2001-03-13 |
| 5979593 | Hybrid mode-scattering/sound-absorbing segmented liner system and method | Edward J. Rice, Bruce E. Walker | 1999-11-09 |
| 5386479 | Piezoelectric sound sources | — | 1995-01-31 |
| 5119427 | Extended frequency range Helmholtz resonators | Jin Tso | 1992-06-02 |
| 4596921 | Low noise hand-held hairdryer | Murray S. Welkowsky | 1986-06-24 |