Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11024777 | Light source device | Kazuhiko Yamanaka, Kenichi Matsumoto, Hideo Yamaguchi, Wakahiko Okazaki, Yasuhiko Enami +2 more | 2021-06-01 |
| 7605638 | Semiconductor integrated circuit including charge pump circuit | Toshinobu Nagasawa, Tetsushi Toyooka, Keiichi Fujii | 2009-10-20 |
| 7518431 | Semiconductor integrated circuit for processing audio and video signals | Keiichi Fujii | 2009-04-14 |
| 7312650 | Step-down voltage output circuit | Keiichi Fujii, Yasunobu Kakumoto, Toshinobu Nagasawa | 2007-12-25 |
| 7307465 | Step-down voltage output circuit | Keiichi Fujii | 2007-12-11 |
| 6977550 | AGC circuit | Takuma Ishida, Keiichi Fujii | 2005-12-20 |
| 6972619 | Amplifier with a gain proportional to power source voltage | Masaharu Sato, Takuma Ishida | 2005-12-06 |
| 6891407 | Analog signal level detecting apparatus | Keiichi Fujii, Takuma Ishida | 2005-05-10 |