Masayuki Nishikawa
36Patents
9h-index
49Co-inventors
75Inventor score
Filing activity: Mar 2, 1988 → Aug 3, 2009
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5139911A | Electrophotographic photoreceptor with two part surface layer | Physics | 65 | Expired |
| US5393629A | Electrophotographic photoreceptor | Physics | 36 | Expired |
| US5578156A | Method of mounting a lens on a light emitting diode | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5834761A | Image input apparatus having a spatial filter controller | Electricity | 26 | Expired |
| US5262262A | Electrophotographic photoreceptor having conductive layer and amorphous carbon overlayer | Physics | 20 | Expired |
| US5786901A | Image shifting mechanism and imaging device | Electricity | 19 | Expired |
| US5637861A | Imaging apparatus having improved resolution due to control of an inclination angle of a refracting plate in more than one direction | Electricity | 18 | Expired |
| US6342978B1 | Pickup device for optical disk | Physics | 11 | Expired |
| US4932859A | Electrophotographic photoreceptor having doped and/or bilayer amorphous silicon photosensitive layer | Physics | 9 | Expired |
| US6778472B2 | Optical pickup with switchable optical systems along an optical path | Physics | 8 | Expired |
| US4960662A | Positively and negatively chargeable electrophotographic photoreceptor | Physics | 7 | Expired |
| US7508605B2 | Zoom lens unit and image pickup device | Physics | 6 | Active |
| US6307687A | Optical pickup device capable of accurate tracking with simple structure | Physics | 5 | Expired |
| US5008170A | Photoreceptor for electrophotography | Physics | 5 | Expired |
| US4923773A | Multilayered electrophotographic photoreceptor of amorphous silicon having a surface layer of nitrogenated amorphous silicon | Physics | 5 | Expired |
| US6268096A | Titanyl phthalocyanine crystal and electrophotographic photoreceptor using the same | Physics | 5 | Expired |
| US4854030A | Process of manufacturing a hose fitting | Emerging Cross-Sectional Technologies | 4 | Expired |
| US5059501A | Electrophotographic photoreceptor with overlayer of amorphous Si with N | Physics | 4 | Expired |
| US4965154A | Electrophotographic photoreceptor having surface layers | Physics | 4 | Expired |
| US4959289A | Electrophotographic element having a surface layer and method for producing same | Physics | 3 | Expired |
| US5075187A | Electrophotographic photoreceptor with oxide of Al, Zr or Ta as charge transport layer | Physics | 3 | Expired |
| US8574798B2 | Electrophotographic photoreceptor, and image forming apparatus and process cartridge using the same | Physics | 3 | Active |
| US5440029A | Titanyl phthalocyanine crystal | Physics | 3 | Expired |
| US4927190A | Hose fitting | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5094929A | Electrophotographic photoreceptor with amorphous carbon containing germanium | Physics | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.