Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4791484 | Tape cartridge case composition for reducing modulation noise | — | 1988-12-13 |
| 4660784 | Tap cartridge | Takashi Sumida, Takao Ketori, Kazuhiro Fujita, Kenji Ogiro | 1987-04-28 |
| 4635879 | Tape cassette | Takashi Sumida, Takao Ketori, Kazuhiro Fujita | 1987-01-13 |