Issued Patents All Time
Showing 26–47 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6466385 | Method and apparatus of forming a magnetic disk with a servo sector and a data sector on a spiral track | Yoshio Umeda, Ryosuke Shimizu, Syuichi Yoshida, Kiyokazu Tohma, Keizo Miyata | 2002-10-15 |
| 6347016 | Master information carrier, process for producing the carrier, and method and apparatus for recording master information signal on magnetic recording medium by using the carrier | Ryuji Sugita, Kiyokazu Tohma, Keizou Miyata, Hiroshi Ryonai | 2002-02-12 |
| 6242085 | Magnetic recording medium and method for producing the same | Hiroshi Ryonai, Kiyokazu Tohma, Keizou Miyata, Taizou Hamada | 2001-06-05 |
| 6088178 | Magnetic recording and reproducing apparatus | Ryuji Sugita, Hiroyuki Hasegawa | 2000-07-11 |
| 5912783 | Magnetic recording and reproducing apparatus having ring-type magnetic head with metallic soft magnetic films of differing thicknesses | Ryuji Sugita, Noriyasu Echigo, Hiroyuki Hasegawa | 1999-06-15 |
| 5901012 | Magnetic recording and reproduction apparatus ring-type magnetic head for recording signals to recording medium having oblique axis of easy magnetization | Ryuji Sugita, Noriyasu Echigo | 1999-05-04 |
| 5691008 | Magnetic recording media fabrication method | Kiyokazu Thoma, Kazunari Yoshimoto, Ryuji Sugita | 1997-11-25 |
| 5679166 | Magnetic recording media, magnetic recording media fabrication method, and fabrication equipment | Kiyokazu Thoma, Kazunari Yoshimoto, Ryuji Sugita | 1997-10-21 |
| 5679410 | Continuous fabrication of thin film magnetic recording medium with vacuum deposition | Ryuji Sugita, Kiyokazu Tohma, Kazunari Yoshimoto | 1997-10-21 |
| 5665460 | Magnetic recording medium | Ryuji Sugita, Kiyokazu Tohma, Kazunari Yoshimoto | 1997-09-09 |
| 5569523 | Magnetic recording medium having a ferromagnetic thin film in which 70% to 90% of the total magnetic particles have residual magnetization vectors within .+-.10.degree. of the easy axis direction | Kiyokazu Thoma, Kazunari Yoshimoto, Ryuji Sugita | 1996-10-29 |
| 5554440 | Magnetic recording medium and method for producing the same | Ryuji Sugita, Kiyokazu Tohma, Yasuaki Ban | 1996-09-10 |
| 5549936 | Manufacturing method of magnetic recording medium | Kiyokazu Tohma, Kazunari Yoshimoto, Ryuji Sugita | 1996-08-27 |
| 5534324 | Magnetic recording medium and method for producing the same | Ryuji Sugita, Kiyokazu Tohma, Yasuaki Ban | 1996-07-09 |
| 5472506 | Method and apparatus for producing magnetic recording medium | Kiyokazu Tohma, Ryuji Sugita, Yasuaki Ban | 1995-12-05 |
| 5458914 | Method for producing magnetic recording medium | Kiyokazu Tohma, Ryuji Sugita, Yasuaki Ban | 1995-10-17 |
| 5433999 | Magnetic recording medium comprising specific backcoat layer | Yoshiki Goto, Yukihiro Shimasaki, Kazuyoshi Honda, Kiyokazu Tohma, Ryuji Sugita +1 more | 1995-07-18 |
| 5427869 | Magnetic recording medium and method for producing the same | Ryuji Sugita, Kiyokazu Tohma, Yasuaki Ban | 1995-06-27 |
| 5418059 | Magnetic recording medium and method for producing the same | Ryuji Sugita, Kiyokazu Tohma, Yasuaki Ban | 1995-05-23 |
| 5298282 | Production of magnetic recording medium | Ryuji Sugita, Kiyokazu Tohma | 1994-03-29 |
| 5202149 | Method for making a magnetic recording medium | Ryuji Sugita, Kiyokazu Tohma, Kazuyoshi Honda, Yasuhiro Kawawake, Yoshiki Goto | 1993-04-13 |
| 5087476 | Method of producing thin film | Kiyokazu Tohma, Ryuji Sugita, Kazuyoshi Honda, Yasuhiro Kawawake | 1992-02-11 |