Issued Patents 2003
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6659647 | Ceramic dynamic pressure bearing, motor with bearing, hard disk device, and polygon scanner | Atsutoshi Sugiyama, Hironobu Ishikawa | 2003-12-09 |
| 6619847 | Ceramic dynamic-pressure bearing, motor having bearing, hard disk drive, and polygon scanner | Hironobu Ishikawa | 2003-09-16 |
| 6619848 | Ceramic dynamic pressure bearing, motor with bearing, hard disc apparatus and polygon scanner | Hironobu Ishikawa, Takayoshi Morishita | 2003-09-16 |
| 6589448 | Ceramic ball for bearing and ceramic ball bearing using the same | Tomonori Niwa | 2003-07-08 |
| 6508591 | Conductive ceramic bearing ball, ball bearing, motor having bearing, hard disk drive, and polygon scanner | Tomonori Niwa | 2003-01-21 |