Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6137891 | Variable geometry electromagnetic transducer | Edward M. Porrazzo | 2000-10-24 |
| 5872855 | Multiple voice coil, multiple function loudspeaker | Edward M. Porrazzo | 1999-02-16 |
| 5627903 | Variable geometry electromagnetic transducer | Edward M. Porrazzo | 1997-05-06 |