Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10068585 | Echo canceller device | Eiji Misawa, Toshio Yagi, Yasumasa Shibata, Hiroyuki Toyozumi, Kiyotsugu Arai | 2018-09-04 |
| 5073946 | Thin speaker having an enclosure with an open portion and a closed portion | Kazue Sato, Kousaku Murata, Tsuneo Tanaka, Shuji Saiki, Satoshi Takayama +6 more | 1991-12-17 |
| 5051942 | Method and apparatus for calculating filter factors | Masaharu Matsumoto, Seiichi Ishikawa | 1991-09-24 |
| 5025474 | Speaker system with image projection screen | Tsuneo Tanaka, Kazue Sato, Hiroyuki Takewa, Akira Kurozuka, Tadashi Tamura +6 more | 1991-06-18 |
| 5023913 | Apparatus for changing a sound field | Masaharu Matsumoto, Seiichi Ishikawa, Mitsuhiko Serikawa, Akihisa Kawamura, Hikari Hashimoto | 1991-06-11 |
| 4924962 | Sound reproducing apparatus for use in vehicle | Kenichi Terai, Shuji Saiki, Kousaku Murata, Yoichi Kumura, Yasutoshi Nakama +2 more | 1990-05-15 |
| 4896285 | Calculation of filter factors for digital filter | Seiichi Ishikawa, Masaharu Matsumoto, Akihisa Kawamura | 1990-01-23 |
| 4888808 | Digital equalizer apparatus enabling separate phase and amplitude characteristic modification | Seiichi Ishikawa, Masaharu Matsumoto, Akihisa Kawamura | 1989-12-19 |
| 4484383 | Method of manufacturing a speaker diaphragm | Hiroyuki Takewa, Seiichi Ishikawa | 1984-11-27 |