Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881137 | Magnetic tape cassette with tape protective closure and lock mechanism | Hiroshi Meguro, Masao Ohyama, Kenichi Horikawa, Shigeru Mizusawa, Kenji Kawakami | 1989-11-14 |
| 4843510 | Magnetic tape cassette with tape protective closure and lock mechanism | Hiroshi Meguro, Masao Ohyama, Kenichi Horikawa, Shigeru Mizusawa, Kenji Kawakami | 1989-06-27 |
| 4830923 | Magnetic recording medium | Kenji Sumiya, Shigeo Aoyama, Yoji Takeuchi | 1989-05-16 |
| 4816953 | Tape cassette with groove engageable with loading hook | Masao Ohyama, Kenichi Horikawa, Kenji Kawakami | 1989-03-28 |