Issued Patents All Time
Showing 26–50 of 68 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7991181 | Loudspeaker system | Toshiyuki Matsumura | 2011-08-02 |
| 7974431 | Speaker system | — | 2011-07-05 |
| 7974423 | Loudspeaker system | Toshiyuki Matsumura, Sawako Kano, Mitsukazu Kuze | 2011-07-05 |
| 7953240 | Loudspeaker apparatus | Toshiyuki Matsumura | 2011-05-31 |
| 7885425 | Electrodynamic electroacoustic transducer and electronic device | Toshiyuki Matsumura, Sawako Kano, Koji Sano | 2011-02-08 |
| 7840022 | Speaker device | Toshiyuki Matsumura, Sawako Kano, Mitsukazu Kuze | 2010-11-23 |
| 7743880 | Sound absorbing structure | Toshiyuki Matsumura | 2010-06-29 |
| 7743877 | Speaker system | Toshiyuki Matsumura | 2010-06-29 |
| 7724915 | Speaker device | Toshiyuki Matsumura | 2010-05-25 |
| 7536211 | Speaker system, mobile terminal device, and electronic device | Sawako Usuki, Shuhei Konishi | 2009-05-19 |
| 7477755 | Speaker system | Mitsukazu Kuze, Toshiyuki Matsumura, Sawako Kano | 2009-01-13 |
| 7463747 | Loudspeaker system | Mitsukazu Kuze, Sawako Kano, Toshiyuki Matsumura | 2008-12-09 |
| 7454025 | Loudspeaker with internal negative stiffness mechanism | — | 2008-11-18 |
| 7382890 | Sound reproduction device and portable terminal apparatus | Sawako Usuki | 2008-06-03 |
| 7231058 | Electroacoustic transducer and electronic apparatus | Sawako Usuki | 2007-06-12 |
| 7212648 | Loudspeaker system in which a diaphragm panel is driven by an electromechanical acoustic converter | Sawako Usuki | 2007-05-01 |
| 7194287 | Electric-mechanical-acoustic-transducer and portable communication device including the same | Sawako Usuki | 2007-03-20 |
| 7187779 | Electromagnetic transducer and portable communication device | Sawako Usuki | 2007-03-06 |
| 7120264 | Sound reproducing apparatus | Sawako Usuki | 2006-10-10 |
| 7106878 | Speaker and mobile terminal device | Sawako Usuki | 2006-09-12 |
| 7085394 | Electro-acoustic transducer and electronic device | Sawako Usuki | 2006-08-01 |
| 7050600 | Speaker system, mobile terminal device, and electronic device | Sawako Usuki, Shuhei Konishi | 2006-05-23 |
| 7006641 | Driving circuit, electro-mechanical-acoustic transducer, and portable terminal apparatus | Sawako Usuki | 2006-02-28 |
| 6920957 | Loudspeaker diaphragm | Sawako Usuki | 2005-07-26 |
| 6920230 | Electromagnetic transducer and portable communication device | Sawako Usuki | 2005-07-19 |