Issued Patents 1994
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5343448 | External magnetic field device for a magnetooptical information recording and reproducing apparatus | Tomoyuki Miyake, Hiroyuki Katayama, Junichiro Nakayama, Kenji Ohta, Shozo Kobayashi | 1994-08-30 |
| 5331621 | Optical pickup apparatus and a hologram element used for same | Yoshio Yoshida, Katushiro Kubo, Tetsuo Ueyama, Yukio Kubata | 1994-07-19 |
| 5283690 | Optical diffraction grating element | Yoshio Yoshida, Yukio Kurata | 1994-02-01 |
| 5283772 | Optical head | Yoshio Yoshida, Yukio Kurata, Hideaki Sato | 1994-02-01 |
| 5279924 | Manufacturing method of optical diffraction grating element with serrated gratings having uniformly etched grooves | Keiji Sakai, Katsuhiro Kubo, Yukio Kurata, Yoshio Yoshida | 1994-01-18 |