Issued Patents All Time
Showing 51–68 of 68 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5457006 | Method of manufacturing photo-mask and photo-mask manufactured thereby | Junji Hirokane, Hiroyuki Katayama, Akira Takahashi, Tetsuya Inui, Kenji Ohta +3 more | 1995-10-10 |
| 5414652 | Magneto-optical memory element | Hiroyuki Katayama, Akira Takahashi, Kenji Ohta | 1995-05-09 |
| 5403683 | Photo-mask | Kenji Ohta, Junji Hirokane, Akira Shibata, Yoshiyuki Nagahara, Kazuo Van +1 more | 1995-04-04 |
| 5402408 | Magneto-optical recording method of overwriting without requiring an initialization magnet | Junji Hirokane, Hiroyuki Katayama, Junichiro Nakayama, Kenji Ohta | 1995-03-28 |
| 5347510 | Method of manufacturing a master plate where its guide groove has an inclined angle | Junji Hirokane, Hiroyuki Katayama, Junichiro Nakayama, Kenji Ohta | 1994-09-13 |
| 5335220 | Optical recording element and driving system | Kenji Ohta, Tetsuya Inui, Hiroyuki Katayama, Akira Takahashi, Junji Hirokane +2 more | 1994-08-02 |
| 5331625 | Optical disc with antistatic coating containing tin oxide and phosphorous | Toshikazu Nagaura, Hirotoshi Takemori, Kenji Ohta, Hiroo Yoshidome | 1994-07-19 |
| 5286583 | Method of manufacturing a photomask for an optical memory | Junji Hirokane, Tetsuya Inui, Kenji Ohta | 1994-02-15 |
| 5260150 | Photo-mask with light shielding film buried in substrate | Kenji Ohta, Junji Hirokane, Akira Shibata, Yoshiyuki Nagahara, Kazuo Van +1 more | 1993-11-09 |
| 5170390 | Optical recording element and driving system | Kenji Ohta, Tetsuya Inui, Hiroyuki Katayama, Akira Takahashi, Junji Hirokane +2 more | 1992-12-08 |
| 5087535 | Method of manufacturing photo-mask and photo-mask manufactured thereby | Junji Hirokane, Hiroyuki Katayama, Akira Takahashi, Tetsuya Inui, Kenji Ohta +3 more | 1992-02-11 |
| 5081614 | Magneto-optical head utilizing central and peripheral portions of reflected light flux for different purposes | Akira Takahashi, Toshihisa Deguchi, Yoshiteru Murakami, Kazuo Van, Kenji Ohta +2 more | 1992-01-14 |
| 5079113 | Photo-mask | Kenji Ohta, Junji Hirokane, Akira Shibata, Yoshiyuki Nagahara, Kazuo Van +1 more | 1992-01-07 |
| 5059473 | Optical recording medium and manufacturing method thereof | Akira Takahashi, Yoshiteru Murakami, Junichiro Nakayama, Tomoyuki Miyake, Kenji Ohta | 1991-10-22 |
| 5053611 | Device for reducing mechanical vibrations when utilizing a magneto-optical card as a recording medium | Akira Takahashi, Yoshiteru Murakami, Junichiro Nakayama, Kenji Ohta, Hiroyuki Katayama | 1991-10-01 |
| 4858212 | Recording method on magnetooptical disc with laser magnetic field | Akira Takahashi, Yoshiteru Murakami, Tomoyuki Miyake, Kenji Ohta | 1989-08-15 |
| 4786559 | Magnetooptical storage element | Yoshiteru Murakami, Akira Takahashi, Hiroyuki Katayama, Tomoyuki Miyake, Kenji Ohta | 1988-11-22 |
| 4754355 | Optical head | Akira Takahashi, Toshihisa Deguchi, Yoshiteru Murakami, Kazuo Van, Kenji Ohta | 1988-06-28 |