Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4815139 | Active acoustic attenuation system for higher order mode non-uniform sound field in a duct | Mark C. Allie, Richard H. Hoops | 1989-03-21 |
| 4811309 | Microphone probe for acoustic measurement in turbulent flow | Mark C. Allie, Richard H. Hoops | 1989-03-07 |