Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6825593 | Piezoelectric type electric acoustic converter | — | 2004-11-30 |
| 6794799 | Piezoelectric electroacoustic transducer | Yuji Kosugi, Manabu Sumita | 2004-09-21 |
| 6744180 | Piezoelectric electroacoustic transducer | Yoshitaka Nakamura, Kiyotaka Tajima, Yuko Yokoi, Tadashi Okuzawa | 2004-06-01 |
| 6741710 | Piezoelectric electroacoustic transducer | Takeshi Kishimoto, Takashi Yamamoto, Kazuaki Hamada | 2004-05-25 |