Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6671383 | Electromagnetic transducer and portable communication device | Sawako Usuki | 2003-12-30 |
| 6658133 | Electromagnetic transducer and portable communicating device | Sawako Usuki | 2003-12-02 |
| 6600400 | Electromagnetic electro-acoustic transducer | Kimihiro Andou, Mitsutaka Enomoto, Masaki Suzumura, Katsuhiko Minaga, Sawako Usuki | 2003-07-29 |