Issued Patents All Time
Showing 1–25 of 35 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7394607 | Disk drive with position detection | Jun Ohno, Hiroyasu Tanabe, Noboru Suzuki | 2008-07-01 |
| 6069762 | Magnetic recording drive having arrangement for averaging useful life of magnetoresistive effect sensors | Hajime Aoi, Makoto Koizumi, Nobumasa Nishiyama, Yoshibumi Matsuda, Takuji Ogawa +1 more | 2000-05-30 |
| 6014275 | Magnetic recording drive | Hajime Aoi, Makoto Koizumi, Nobumasa Nishiyama, Yoshibumi Matsuda, Takuji Ogawa +1 more | 2000-01-11 |
| 5959943 | Information recording medium with clock information therein | Seiji Yonezawa, Norio Ohta, Toshio Niihara, Keiji Kataoka, Masahiko Takahashi +2 more | 1999-09-28 |
| 5953178 | Magnetic disk apparatus | Akio Takatsuka, Hideaki Amano, Katsuhiro Tsuneta, Tetsuji Kameoka, Haruhiko Hosokawa +5 more | 1999-09-14 |
| 5886958 | Information recording apparatus and method for modulated magneto-optical recording medium | Seiji Yonezawa, Norio Ohta, Toshio Niihara, Keiji Kataoka, Masahiko Takahashi +2 more | 1999-03-23 |
| 5726955 | Magneto optical recording medium apparatus and method utilizing light pulse magnetic modulation recording | Seiji Yonezawa, Norio Ohta, Toshio Niihara, Keiji Kataoka, Masahiko Takahashi +2 more | 1998-03-10 |
| 5719719 | Magnetic disk drive with sensing current adjustment of MR head | Futoshi Tomiyama | 1998-02-17 |
| 5715110 | Magnetic recording and reproducing apparatus with thermal asperity correction | Nobumasa Nishiyama | 1998-02-03 |
| 5657176 | Method and apparatus for optimizing the recording and reproducing of information from magnetic disks | Yoshihiro Moribe, Tetsuji Kameoka, Sumio Obata | 1997-08-12 |
| 5579292 | Magneto-optical data recording apparatus using a sample-servo system for applying heating pulses to record data | Seiji Yonezawa, Norio Ohta, Toshio Niihara, Keiji Kataoka, Masahiko Takahashi +2 more | 1996-11-26 |
| 5572379 | Magnetic recording drive having arrangements for average useful life of magnetorestive effects sensors | Hajime Aoi, Makoto Koizumi, Nobumasa Nishiyama, Yoshibumi Matsuda, Takuji Ogawa +1 more | 1996-11-05 |
| 5473581 | Magneto-optical data recording system continuously irradiating optical pulsers | Seiji Yonezawa, Norio Ohta, Toshio Niihara, Keiji Kataoka, Masahiko Takahashi +2 more | 1995-12-05 |
| 5430581 | Method and apparatus for optimizing the recording and reproducing of information from magnetic disks | Yoshihiro Moribe, Tetsji Kameoka, Sumio Obata | 1995-07-04 |
| 5367411 | Magnetic recording and reproducing apparatus with reproducing head of magnetoresistive type having control of magnetic bias level | Nobumasa Nishiyama, Yasuhiro Kato | 1994-11-22 |
| 5337198 | Digital magnetic writing and reading apparatus | Nobumasa Nishiyama, Hajime Aoi, Tetsuji Kameoka, Masaya Tanaka, Kazuhisa Shiraishi | 1994-08-09 |
| 5218599 | Method of recording and reproduction of information using a recording medium available for information overlap recording, a recording medium and a recording and reproducing apparatus using the method | Yoshito Tsunoda, Hiromichi Fujisawa | 1993-06-08 |
| 5193034 | Magnetic disk apparatus of constant-density recording type, magnetic disk used therefor and servo-writing device for patterning on the magnetic disk | Yosuke Seo, Hajime Aoi, Makoto Saito | 1993-03-09 |
| 5170383 | Magneto-optical data recording system | Seiji Yonezawa, Norio Ohta, Toshio Niihara, Keiji Kataoka, Masahiko Takahashi +2 more | 1992-12-08 |
| 5132854 | High speed seek sector servo magnetic disk drive unit | Yosuke Seo, Hajime Aoi | 1992-07-21 |
| 5083226 | Magnetic disk drive | Kazuo Shiiki, Yoshihiro Shiroishi, Norio Ohta, Hisashi Takano, Fumio Kugiya | 1992-01-21 |
| 4949325 | Method and associated apparatus and medium for optical recording and reproducing information | Masatoshi Ohtake, Wasao Takasugi, Seiji Yonezawa, Takashi Takeuchi, Tadashi Saitoh | 1990-08-14 |
| 4872152 | Light spot position control system and method by sampled servo | Masatoshi Ohtake, Wasao Takasugi, Seiji Yonezawa | 1989-10-03 |
| 4866688 | Composite tracking servo system for optical disc apparatus with track offset correction | Masatoshi Ohtake, Seiji Yonezawa, Kazuo Ichino, Yukio Fukui, Takashi Takeuchi +2 more | 1989-09-12 |
| 4847822 | Optical information recording and reproducing apparatus with tracking control by sampling | Wasao Takasugi, Seiji Yonezawa, Masatoshi Ohtake | 1989-07-11 |