Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6404946 | Arrayed waveguide grating type optical multiplexer/demultiplexer | Takeshi Nakajima, Toshihiko Ohta, Shiro Nakamura | 2002-06-11 |
| 6393170 | Optical multiplexer/demultiplexer | Takeshi Nakajima, Naoki Hashizume | 2002-05-21 |
| 6320695 | Optical amplifying apparatus | Katsuhiko Iwashita, Shoichi Ozawa | 2001-11-20 |
| 4874436 | Method for producing high purity electrolytic copper | Takashi Ogata, Masanori Kato, Yoshio Kawasumi, Chikara Tominaga | 1989-10-17 |
| 4864637 | FMX stereophonic broadcast receiver | Tsutomu Ishikawa, Noboru Usui, Ryuichi Ogawa, Kazuhisa Ishiguro, Masashi Arai | 1989-09-05 |
| 4852167 | FMX stereophonic receiver | Noboru Usui, Ryuichi Ogawa, Tsutomu Ishikawa, Kazuhisa Ishiguro, Masashi Arai | 1989-07-25 |
| 4809328 | FM/FMX stereophonic receiver | Noboru Usui, Ryuichi Ogawa, Tsutomu Ishikawa, Kazuhisa Ishiguro, Masashi Arai | 1989-02-28 |
| 4792369 | Copper wires used for transmitting sounds or images | Takashi Ogata, Masanori Kato, Yoshio Kawasumi, Chikara Tominaga | 1988-12-20 |
| 4757539 | Apparatus and method for decoding an AM stereo broadcasting signal of an independent sideband system | Masashi Arai | 1988-07-12 |
| 4707856 | AM stereo receiver | Masashi Arai | 1987-11-17 |
| 4587500 | Variable reactance circuit producing negative to positive varying reactance | Kazuhisa Ishiguro | 1986-05-06 |
| 4399325 | Demodulating circuit for controlling stereo separation | Noboru Usui | 1983-08-16 |
| 4225767 | Microwave oven having uneven bottom wall oven cavity | Takayoshi Hatanaka, Tsuguharu Yakushiji | 1980-09-30 |