Issued Patents All Time
Showing 76–100 of 101 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5317555 | Optical head device utilizing partially overlapping light spots to read information from a readout layer | Akira Takahashi, Junsaku Nakajima, Kenji Ohta | 1994-05-31 |
| 5305254 | Magneto-optic memory device | Junichiro Nakayama, Ichiro Hiramatsu, Akira Takahashi, Kenji Ohta, Kazuo Van +1 more | 1994-04-19 |
| 5305300 | Magneto optical storage device using a multi-layer film of Pt/Co laminated sections | Kenji Ohta, Akira Takahashi, Junsaku Nakajima | 1994-04-19 |
| 5293359 | Magnetic recording and reproducing apparatus having a ferrimagnetic recording medium, a magnetic head and first and second light sources | Kenji Ohta, Akira Takahashi, Junsaku Nakajima, Junji Hirokane | 1994-03-08 |
| 5202860 | Magneto-optic reproducing device using right and left circularly polarized light | Akira Takahashi, Junsaku Nakayima, Kenji Ohta | 1993-04-13 |
| 5175079 | Optical memory device | Kazuo Van, Kenji Ohta | 1992-12-29 |
| 5082690 | Process for manufacturing a magneto-optic disc | Tomoyuki Miyake, Hiroyuki Katayama, Junichiro Nakayama, Kenji Ohta | 1992-01-21 |
| 5081614 | Magneto-optical head utilizing central and peripheral portions of reflected light flux for different purposes | Akira Takahashi, Toshihisa Deguchi, Michinobu Mieda, Kazuo Van, Kenji Ohta +2 more | 1992-01-14 |
| 5066381 | Target unit | Kenji Ohta, Nobuyuki Takamori, Kenichi Hijikata, Takyuki Shingyoji, Kazushige Takaishi | 1991-11-19 |
| 5059473 | Optical recording medium and manufacturing method thereof | Akira Takahashi, Michinobu Mieda, Junichiro Nakayama, Tomoyuki Miyake, Kenji Ohta | 1991-10-22 |
| 5058099 | Magneto-optical memory element | Akira Takahashi, Kazuo Van, Junichiro Nakayama, Hiroyuki Katayama, Kouji Ohta | 1991-10-15 |
| 5053611 | Device for reducing mechanical vibrations when utilizing a magneto-optical card as a recording medium | Akira Takahashi, Junichiro Nakayama, Kenji Ohta, Hiroyuki Katayama, Michinobu Mieda | 1991-10-01 |
| 5002813 | Substrate with protective film and method of manufacturing optical memory device using the same | Junichiro Nakayama, Kenji Ohta, Hiroyuki Katayama, Akira Takahashi | 1991-03-26 |
| 4985885 | Optical memory device | Kenji Ohta, Akira Takahashi, Hiroyuki Katayama, Junji Hirokane | 1991-01-15 |
| 4956243 | Optical memory element | Tomoyuki Miyake, Hiroyuki Katayama, Akira Takahashi, Kenji Ohta | 1990-09-11 |
| 4917751 | Method of producing double sided optical memory disks | Kenji Ohta, Hiroyuki Katayama, Akira Takahashi, Junji Hirokane | 1990-04-17 |
| 4858212 | Recording method on magnetooptical disc with laser magnetic field | Akira Takahashi, Michinobu Mieda, Tomoyuki Miyake, Kenji Ohta | 1989-08-15 |
| 4818648 | Optical memory element | Kenji Ohta, Akira Takahashi, Tetsuya Inui, Hiroyuki Katayama, Junji Hirokane | 1989-04-04 |
| 4792474 | Optical memory element | Akira Takahashi, Yoshikazu Fujii, Hiroyuki Katayama, Kenji Ohta | 1988-12-20 |
| 4786559 | Magnetooptical storage element | Akira Takahashi, Hiroyuki Katayama, Tomoyuki Miyake, Kenji Ohta, Michinobu Mieda | 1988-11-22 |
| 4754355 | Optical head | Akira Takahashi, Toshihisa Deguchi, Michinobu Mieda, Kazuo Van, Kenji Ohta | 1988-06-28 |
| 4740947 | Dual surface optical memory disc | Kenji Ohta, Akira Takahashi, Hiroyuki Katayama, Junji Hirogane | 1988-04-26 |
| 4719137 | Magneto-optic memory element | Kenji Ohta, Akira Takahashi, Hiroyuki Katayama, Junji Hirogane | 1988-01-12 |
| 4717628 | Magnetooptical storage element | Akira Takahashi, Hiroyuki Katayama, Junji Hirokane, Kenji Ohta | 1988-01-05 |
| 4695514 | Magneto-optical memory element | Akira Takahashi, Junji Hirokane, Hiroyuki Katayama, Kenji Ohta | 1987-09-22 |