Katsutoshi Nii
37Patents
13h-index
68Co-inventors
84Inventor score
Filing activity: Oct 4, 1978 → Dec 22, 2006
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4938611A | Bearing apparatus | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US5325006A | Sealed magnetic fluid bearing for polygon mirror drive motor | Mechanical Engineering; Lighting; Heating | 28 | Expired |
| US5834870A | Oil impregnated porous bearing units and motors provided with same | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US5574322A | Motor, a printer having such a motor and a disk drive system having such a motor | Mechanical Engineering; Lighting; Heating | 23 | Expired |
| US4508396A | Method of producing bearing component | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US5417507A | Vertical motor, method of manufacturing same, polygon mirror motor using said motor, and bearing device for use in said motor | Electricity | 19 | Expired |
| US6477133B1 | Disk drive with unbalance correcting mechanism | Physics | 17 | Expired |
| US5108198A | Magnetic fluid bearing apparatus and motor having magnetic fluid bearing apparatus | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US5493161A | Sealed magnetic fluid bearing for polygon mirror drive motor | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US5645355A | Bearing unit | Emerging Cross-Sectional Technologies | 16 | Expired |
| US6771460B2 | Spindle motor and magnetic disc device using thereof having radial and thrust bearings | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US6756715B2 | Spindle motor | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US5469008A | Motor with a bearing lubricated by magnetic fluid | Physics | 14 | Expired |
| US5035519A | Submersible thrust bearing apparatus | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5810481A | Oil retaining bearing unit and motor having oil retaining bearing unit | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5821655A | Magnetic fluid bearing unit structure and motor having the same | Electricity | 12 | Expired |
| US5541462A | Rotary body bearing apparatus, motor and polygon mirror motor | Electricity | 12 | Expired |
| US6243230A | Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unit | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US6574186B2 | Assembly method of motor using magnetic lubrication fluid | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US6356408B1 | Magnetic disk apparatus, including spindle motor having air flow passage in hub for pressure balance | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4746268A | End face mechanical shaft seal for use in hydraulic machines and seal ring assembly for use in the shaft seal | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| USRE35718E | Bearing apparatus | General | 8 | Expired |
| US4529209A | Hydraulic machine shaft seal with centrifugal removal of sand and soil particles | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4433432A | X-Ray tube apparatus | Electricity | 7 | Expired |
| US6469866B1 | Spindle motor and magnetic disc device with hydrodynamic bearing | Mechanical Engineering; Lighting; Heating | 7 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.