System Seiko Co., Ltd.
10Patents
0Active
10Granted
28Portfolio score
Filing activity: Oct 31, 1991 → Jun 30, 1999
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5357645A | Apparatus for cleaning and drying hard disk substrates | Emerging Cross-Sectional Technologies | 47 | Expired |
| US6033522A | Surface treatment method and apparatus for rotatable disc | Physics | 35 | Expired |
| US5140774A | Apparatus for polishing hard disk substrates | Performing Operations; Transporting | 30 | Expired |
| US6089959A | Polishing method and polishing apparatus | Performing Operations; Transporting | 26 | Expired |
| US5538460A | Apparatus for grinding hard disk substrates | Performing Operations; Transporting | 16 | Expired |
| US6152804A | Grinding method and grinding apparatus | Performing Operations; Transporting | 10 | Expired |
| US6275032A | Surface flatness measuring apparatus | Physics | 7 | Expired |
| US6011618A | Method and apparatus of surface inspection of a disk | Physics | 5 | Expired |
| US5685040A | Apparatus for cleaning and drying hard disk substrates | Physics | 1 | Expired |
| US5875505A | Apparatus for cleaning and drying hard disk substrates | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.