Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845759 | Sound source having a plurality of drivers operating from a virtual point | — | 1989-07-04 |
| 4841495 | Horn loaded transducer for acoustic levitation | Charles A. Rey | 1989-06-20 |