Hajime Oyama
118Patents
21h-index
103Co-inventors
93Inventor score
Filing activity: Nov 17, 1976 → May 18, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6505014B2 | Image forming apparatus and an image forming process unit | Physics | 72 | Expired |
| US5805965A | Developing device for an image forming apparatus having developer distribution features | Physics | 58 | Expired |
| US5659860A | Developing device for an image forming apparatus and toner cartridge | Physics | 56 | Expired |
| US5771426A | Developing device using a toner and carrier mixture | Physics | 45 | Expired |
| US6611672B2 | Image forming apparatus, monocolor image forming apparatus, toner recycling apparatus and intermediate transfer member | Physics | 44 | Expired |
| US6721516B2 | Image forming apparatus | Physics | 43 | Expired |
| US4194830A | Development apparatus | Physics | 41 | Expired |
| US5822664A | Developing machine which uses a developing agent including a toner and magnetic particles | Physics | 38 | Expired |
| US6658227B2 | Development method apparatus, image formation and process cartridge for suppressing variation in toner charge | Physics | 33 | Expired |
| US5198861A | Image density control method for an image forming apparatus for reducing background contamination of a photoconductive drum | Physics | 33 | Expired |
| US5083160A | Image density control method and color image forming apparatus | Physics | 33 | Expired |
| US7171145B2 | Developing device and process cartridge for an image forming apparatus | Physics | 32 | Expired |
| US5758241A | Developing device for an image forming apparatus | Physics | 32 | Expired |
| US5864733A | Developing device for image forming apparatus | Physics | 31 | Expired |
| US4382420A | Development apparatus | Physics | 28 | Expired |
| US5182600A | Toner end detecting method for an electrophotographic copier | Physics | 27 | Expired |
| US4286543A | Apparatus for developing electrostatic image | Physics | 25 | Expired |
| US5771429A | Developing device capable of automatic toner content control | Physics | 25 | Expired |
| US7890231B2 | Lane keeping assistance equipment for automotive vehicles | Performing Operations; Transporting | 23 | Active |
| US4406536A | Developing device | Physics | 22 | Expired |
| US5450177A | Image forming apparatus having a toner concentration control capability with a toner concentration sensor disposed in a developing unit | Physics | 22 | Expired |
| US4165393A | Magnetic brush developing process for electrostatic images | Physics | 21 | Expired |
| US7035575B2 | Developing device, image forming apparatus, and process cartridge | Physics | 19 | Expired |
| US6686845B2 | Driver's arousal level estimating apparatus for vehicle and method of estimating arousal level | Performing Operations; Transporting | 17 | Expired |
| US7084773B2 | Wakefulness estimating apparatus and method | Human Necessities | 17 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.