Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837834 | Active acoustic attenuation system with differential filtering | — | 1989-06-06 |
| 4815139 | Active acoustic attenuation system for higher order mode non-uniform sound field in a duct | Larry J. Eriksson, Richard H. Hoops | 1989-03-21 |
| 4811309 | Microphone probe for acoustic measurement in turbulent flow | Larry J. Eriksson, Richard H. Hoops | 1989-03-07 |