Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6589448 | Ceramic ball for bearing and ceramic ball bearing using the same | Tetsuji Yogo | 2003-07-08 |
| 6508591 | Conductive ceramic bearing ball, ball bearing, motor having bearing, hard disk drive, and polygon scanner | Tetsuji Yogo | 2003-01-21 |