Issued Patents All Time
Showing 1–25 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7580329 | Optical recording medium recorded with information in depth direction, and method and apparatus of reproduction therefrom | Hitoshi Takeuchi, Masaru Nomura, Kenji Ohta | 2009-08-25 |
| 7113460 | Optical disk having pits of different depths formed therein, optical disk reproducing apparatus for reproducing the optical disk, and method of tracking the optical disk | Hitoshi Takeuchi, Masaru Nomura, Kenji Ohta | 2006-09-26 |
| 7072251 | Optical disc having pits of different depth formed therein, optical disc device for reproducing the same, and method of reproduction | Hitoshi Takeuchi, Masaru Nomura | 2006-07-04 |
| 7050383 | Optical recording medium recorded with information in depth direction, and method and apparatus of reproduction therefrom | Hitoshi Takeuchi, Masaru Nomura, Kenji Ohta | 2006-05-23 |
| 6760299 | Optical disc having pits of different depth formed therein, optical disc device for reproducing the same, and method of reproduction | Hitoshi Takeuchi, Masaru Nomura | 2004-07-06 |
| 6728183 | Optical disk device | Hitoshi Takeuchi | 2004-04-27 |
| 6665235 | Magneto-optical recording medium and recording and reproducing method and optical head designed for the magneto-optical recording medium | Yoshiteru Murakami, Junji Hirokane, Junichiro Nakayama, Akira Takahashi, Kenji Ohta +1 more | 2003-12-16 |
| 6556517 | Magneto-optical head device having integrated auxiliary lens and magnetic reproducing head and recording and reproducing device using magneto-optical head device | — | 2003-04-29 |
| 6532208 | Optical recording medium having prepits deeper than grooves | — | 2003-03-11 |
| 6487165 | Optical recording medium | — | 2002-11-26 |
| 6483785 | Magneto-optical recording method using the relation of beam diameter and an aperture of converging lens | Yoshiteru Murakami, Junji Hirokane, Junichiro Nakayama, Akira Takahashi, Kenji Ohta +1 more | 2002-11-19 |
| 6438098 | Optical recording medium, media tracking method and recording/reproducing apparatus | Masaru Nomura, Hitoshi Takeuchi | 2002-08-20 |
| 6396775 | Magneto-optical device and recording/reproducing method | — | 2002-05-28 |
| 6317280 | Thermomagnetic recording and reproducing head having a heating head with a width narrower than the magnetic heads, a recording and reproducing device with such a heating head and methods related thereto | Takeshi Yamaguchi | 2001-11-13 |
| 6272077 | Magneto-optical recording medium having intermediate layer of in plane magnetization | Akira Takahashi, Michinobu Mieda, Naoyasu Iketani, Go Mori, Yoshiteru Murakami +1 more | 2001-08-07 |
| 6261707 | Magneto-optical recording medium and recording and reproducing method and optical head designed for the magneto-optical recording medium | Yoshiteru Murakami, Junji Hirokane, Junichiro Nakayama, Akira Takahashi, Kenji Ohta +1 more | 2001-07-17 |
| 6212137 | Magneto-optical recording medium by magnetic field modulation with the use of smaller magnetic fields | — | 2001-04-03 |
| 6147939 | Magneto-optical recording medium having intermediate layer of in-plane magnetization | Akira Takahashi, Michinobu Mieda, Naoyasu Iketani, Go Mori, Yoshiteru Murakami +1 more | 2000-11-14 |
| 6143436 | Magnetic recording medium and information recording-reproduction method using the same | Akira Takahashi, Junji Hirokane, Yoshiteru Murakami, Kenji Ohta | 2000-11-07 |
| 6042954 | Magneto-optical recording medium | Junji Hirokane, Junichiro Nakayama, Akira Takahashi | 2000-03-28 |
| 5989705 | Magneto-optical recording medium | Yoshiteru Murakami, Akira Takahashi, Junji Hirokane | 1999-11-23 |
| 5777953 | Arrangement of magneto-optical recording medium which capable of reproducing an individual bit | Junji Hirokane, Junichiro Nakayama, Akira Takahashi, Kenji Ohta | 1998-07-07 |
| 5757734 | Magneto-optical recording medium and method for reproducing from same | Junji Hirokane, Yoshiteru Murakami, Akira Takahashi | 1998-05-26 |
| 5707727 | Magneto-optical recording medium | Akira Takahashi, Yoshiteru Murakami, Kenji Ohta, Junichiro Nakayama, Hiroyuki Katayama +1 more | 1998-01-13 |
| 5657299 | Magneto-optical recording medium | Yoshiteru Murakami, Akira Takahashi | 1997-08-12 |