Issued Patents 2004
Showing 1–2 of 2 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 |