Hideaki Hagihara
21Patents
13h-index
50Co-inventors
84Inventor score
Filing activity: Jul 28, 1981 → Apr 11, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4952989A | Photoreceptor attachment device for an electrophotographic copying machine | Physics | 65 | Expired |
| US5398098A | Image forming apparatus | Physics | 52 | Expired |
| US4849791A | Waste toner collecting system | Physics | 47 | Expired |
| US6212338A | Image forming device with communication to supplementary toner container | Physics | 34 | Expired |
| US4970557A | Electrophotographic apparatus controlling image quality according to condition of deterioration | Physics | 32 | Expired |
| US4998140A | Developing device for copier with sealing means | Physics | 26 | Expired |
| US5915691A | Document feeder and cover for an image forming apparatus | Emerging Cross-Sectional Technologies | 22 | Expired |
| US4650097A | Developer material supply arrangement | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4579328A | Copy paper feeding device for electrophotographic copying machine | Physics | 18 | Expired |
| US5440376A | Electrophotographic apparatus | Physics | 18 | Expired |
| US5592270A | Developing device in an electrophotographic apparatus capable of controlling a discharge of deteriorated developer and method of discharging deteriorated developer | Physics | 17 | Expired |
| US5393044A | Paper feeder | Performing Operations; Transporting | 14 | Expired |
| US5624107A | Image forming apparatus with a document feeder | Physics | 14 | Expired |
| US5576820A | Xerographic apparatus with a detachable corona charger | Physics | 13 | Expired |
| US5194900A | Developer cartridge having easily removable sealing material | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4914481A | Developing apparatus | Physics | 8 | Expired |
| US5175587A | Developing apparatus having a detachable developer cartridge | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4440280A | Spring clutch mechanism | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US6311025A | Interchangeable part recognizing apparatus and image forming apparatus | Physics | 6 | Expired |
| US6628910B2 | Toner cartridge for image forming apparatus | Physics | 3 | Expired |
| US4920026A | Image formation method and apparatus using light and pressure sensitive sheets | Physics | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.