Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6710974 | Tape cassette of high transparency material | Shigeru Ishikawa, Hiroyuki Umeda, Yasufumi Hashimoto | 2004-03-23 |
| 6680819 | Tape cassette of high transparency material | Shigeru Ishikawa, Hiroyuki Umeda, Yasufumi Hashimoto | 2004-01-20 |
| 6587306 | Tape cassette of high transparency material | Shigeru Ishikawa, Hiroyuki Umeda, Yasufumi Hashimoto | 2003-07-01 |
| 4931743 | Noise reduction circuit | Hisatoshi Fukuda | 1990-06-05 |
| 4698693 | Audio magnetic recording and/or reproducing apparatus utilizing frequency modulation | Yukinobu Ishigaki, Yasuomi Namiki, Kazutoshi Hirohashi | 1987-10-06 |