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, Hisashige Fujiwara | 2004-03-23 |
| 6680819 | Tape cassette of high transparency material | Shigeru Ishikawa, Hiroyuki Umeda, Hisashige Fujiwara | 2004-01-20 |
| 6607155 | Magnetic tape cassette | Satoru Takaha | 2003-08-19 |
| 6587306 | Tape cassette of high transparency material | Shigeru Ishikawa, Hiroyuki Umeda, Hisashige Fujiwara | 2003-07-01 |
| 5543991 | Tape cassette having a rear cover composed of two pieces of plates rotatably connected to each other | Hiroyuki Umeda, Tsunehisa Ohira | 1996-08-06 |