Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE35302 | Magnetic disc apparatus | Takayasu Muto | 1996-07-23 |
| 5235478 | Disc drive apparatus with servo tracks offset from data tracks | Hiroyuki Suzukawa | 1993-08-10 |
| 5227926 | Duplicator system manageable of life of mother tape | Kazuo Nagaoka, Hirofumi Yoshida, Yoshiki Takao | 1993-07-13 |
| 5138511 | Magnetic recording disk in which the level of the surface of the data tracks, and servo tracks is higher than that of the guardbands | Ichiroh Saitoh | 1992-08-11 |
| 4974109 | Hard disk drive employing a reference track to compensate for tracking error | Takayasu Muto | 1990-11-27 |
| 4453250 | PCM Signal processing apparatus | Tadashi Kojima | 1984-06-05 |
| 4451920 | PCM Signal processing apparatus | Tadashi Kojima | 1984-05-29 |
| 4446490 | PCM Signal processing circuit | Tadashi Kojima | 1984-05-01 |
| 4417283 | Digital signal processing system | Tadashi Kojima | 1983-11-22 |
| 4404602 | PCM Signal recording system | Tadashi Kojima | 1983-09-13 |
| 4258299 | Apparatus for controlling the speed and direction of rotation of a DC motor | Masashi Takeda, Toshio Sato | 1981-03-24 |
| 4220879 | Brushless DC motor | Kenzo Nakagawa | 1980-09-02 |