Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886714 | Platelike magnetic powder and a recording medium which uses the platelike magnetic powder | Hideo Torii, Hideaki Komoda, Nobuyuki Aoki, Ikuo Ota, Keiichi Ochiai | 1989-12-12 |
| 4842633 | Method of manufacturing molds for molding optical glass elements and diffraction gratings | Kiyoshi Kuribayashi, Makoto Umetani, Hideto Monji | 1989-06-27 |
| 4811148 | Alloy magnetic recording head | Masayuki Sakai, Hideo Torii, Hideyuki Okinaka, Hozumi Hirota | 1989-03-07 |