Takayuki Maruta
25Patents
15h-index
43Co-inventors
77Inventor score
Filing activity: May 26, 1988 → Nov 14, 2005
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4916547A | Color image forming apparatus | Physics | 58 | Expired |
| US5860038A | Apparatus and method for detecting developing ability of an image forming apparatus | Physics | 56 | Expired |
| US5270783A | Image forming equipment having improved toner sensing | Physics | 46 | Expired |
| US6160569A | Image forming apparatus capable of changing process line speed | Electricity | 45 | Expired |
| US5384628A | Developing device for image forming equipment | Physics | 44 | Expired |
| US5227842A | Electrophotographic image forming apparatus which controls developer bias based on image irregularity | Physics | 39 | Expired |
| US6055386A | Apparatus and method for detecting developing ability of an image forming apparatus with varied LED continuous lighting time for image forming and process control modes | Physics | 38 | Expired |
| US5671470A | Color image forming device which changes developing bias when switching between developer units | Physics | 35 | Expired |
| US6226481A | Image forming apparatus with control over developing unit during an idle running of an intermediate image transfer body | Physics | 32 | Expired |
| US5826146A | Color image forming device which changes developing bias when switching between developer units | Physics | 31 | Expired |
| US5298944A | Testing image density to control toner concentration and dynamic range in a digital copier | Physics | 23 | Expired |
| US6823149B2 | Image forming apparatus with variable speed transferring and fixing devices | Physics | 23 | Expired |
| US5424809A | Image forming method and apparatus for the same | Physics | 19 | Expired |
| US5835825A | Color image forming device having a revolver developing unit | Physics | 17 | Expired |
| US5724634A | Image forming device in which developer roller speed is controlled in developer transfer to a photoconductive drum | Physics | 17 | Expired |
| US5237369A | Color image forming equipment responsive to changes in ambient conditions | Physics | 15 | Expired |
| US5293198A | Image forming apparatus for controlling the dynamic range of an image | Physics | 14 | Expired |
| US7174124B2 | Tandem color image forming apparatus with an image transfer belt and backup roller | Physics | 14 | Expired |
| US5881334A | Image forming apparatus and method for preventing wasted toner | Physics | 12 | Expired |
| US6535707B2 | Image forming system | Physics | 8 | Expired |
| US7161712B2 | Apparatus for forming images with proper gamma correction | Electricity | 4 | Expired |
| US7474867B2 | Magnetic carrier, two-component developer, development method, development device and image forming apparatus of electrophotography | Physics | 4 | Expired |
| US7139512B2 | Charging device, process cartridge and image forming apparatus | Physics | 4 | Expired |
| USRE41934E1 | Image forming system | General | 3 | Expired |
| US7139517B2 | Developing method for an image forming apparatus and developing device using the same | Physics | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.