Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6653762 | Piezoelectric type electric acoustic converter | — | 2003-11-25 |
| 6570299 | Piezoelectric electroacoustic transducer and manufacturing method of the same | Manabu Sumita, Kiyotaka Tajima, Yuichi Sakai | 2003-05-27 |