Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6201872 | Active control source cancellation and active control Helmholtz resonator absorption of axial fan rotor-stator interaction noise | Alan S. Hersh, Larry A. Heidelberg, Sr. | 2001-03-13 |
| 5979593 | Hybrid mode-scattering/sound-absorbing segmented liner system and method | Edward J. Rice, Alan S. Hersh | 1999-11-09 |