Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D317155 | Demagnetizer for magnetic head of cassette tape recorder | — | 1991-05-28 |
| D266419 | Magazine of magnetic tape | Keiichi Yoshizawa | 1982-10-05 |
| 4267986 | Magnetic tape cassette | Noboru Uemura, Shunzo Hatakeyama | 1981-05-19 |
| D258287 | Video tape cassette | Keiichi Yoshizawa | 1981-02-17 |