Issued Patents All Time
Showing 26–48 of 48 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6943624 | Radio frequency power amplifier | Masami Ohnishi, Hidetoshi Matsumoto, Osamu Kagaya, Kenji Sekine | 2005-09-13 |
| 6881639 | Method of manufacturing semiconductor device | Kazuhiro Mochizuki, Kiyoshi Ouchi | 2005-04-19 |
| 6853243 | Wireless communication frequency signal amplification apparatus and transmitting and receiving apparatus | Kenji Sekine, Osamu Kagaya | 2005-02-08 |
| 6822517 | Power amplifier module | Hidetoshi Matsumoto, Satoshi Tanaka, Kiichi Yamashita | 2004-11-23 |
| 6816017 | Power amplifier module | Kiichi Yamashita, Isao Ohbu, Kenji Sekine | 2004-11-09 |
| 6775525 | Radio communication apparatus and semiconductor device | Kiichi Yamashita | 2004-08-10 |
| 6771128 | Power amplifier module | Kiichi Yamashita, Shizuo Kondo | 2004-08-03 |
| 6710649 | Power amplifier module | Hidetoshi Matsumoto, Satoshi Tanaka, Kiichi Yamashita | 2004-03-23 |
| 6674323 | High frequency power amplifier, high frequency power amplifier module, and portable telephone | Osamu Kagaya, Masami Ohnishi, Kenji Sekine | 2004-01-06 |
| 5949097 | Semiconductor device, method for manufacturing same, communication system and electric circuit system | Koji Hirata, Hiroshi Masuda, Hiroyuki Uchiyama, Kazuhiro Mochizuki | 1999-09-07 |
| 5604835 | Integrated optical waveguide device | Tohru Nakamura, Takeshi Kato, Mitsuo Takeda | 1997-02-18 |
| 5598015 | Hetero-junction bipolar transistor and semiconductor devices using the same | Hiroshi Masuda, Tohru Nakamura, Takahiro Onai, Katsuyoshi Washio | 1997-01-28 |
| 5481120 | Semiconductor device and its fabrication method | Kazuhiro Mochizuki, Tomoyoshi Mishima, Tohru Nakamura, Hiroshi Masuda, Tooru Haga +1 more | 1996-01-02 |
| 5381027 | Semiconductor device having a heterojunction and a two dimensional gas as an active layer | Toshiyuki Usagawa, Kenji Hiruma, Masahiko Kawata, Shigeo Goto, Katsuhiko Mitani +3 more | 1995-01-10 |
| 5258631 | Semiconductor device having a two-dimensional electron gas as an active layer | Toshiyuki Usagawa, Kenji Hiruma, Masahiko Kawata, Shigeo Goto, Katsuhiko Mitani +3 more | 1993-11-02 |
| 5229623 | Electric circuit using multiple differential negative resistance elements, semiconductor device and neuro chip using the same | Hiroshi Mizuta, Susumu Takahashi | 1993-07-20 |
| 5023687 | Semiconductor device | Chushirou Kusano, Susumu Takahashi | 1991-06-11 |
| 5019524 | Method of manufacturing a heterojunction bipolar transistor | Katsuhiko Mitani, Chushiro Kusano, Masayoshi Kobayashi, Susumu Takahashi | 1991-05-28 |
| 5017973 | Resonant tunneling device | Hiroshi Mizuta, Chushirou Kusano, Susumu Takahashi | 1991-05-21 |
| 5017517 | Method of fabricating semiconductor device using an Sb protection layer | Kazuhiro Mochizuki, Chushirou Kusano, Hiroshi Masuda, Katsuhiko Mitani | 1991-05-21 |
| 4983532 | Process for fabricating heterojunction bipolar transistors | Katsuhiko Mitani, Chushirou Kusano, Susumu Takahashi, Masayoshi Saito, Hiroshi Miyazaki +1 more | 1991-01-08 |
| 4979009 | Heterojunction bipolar transistor | Chushiro Kusano, Katsuhiko Mitani | 1990-12-18 |
| 4553317 | Method of obtaining an impact ionization coefficient rate by junction of different kinds of semiconductors | Hiroyuki Sakaki, Hidetoshi Nojiri | 1985-11-19 |