Koichi Tanigawa
45Patents
20h-index
60Co-inventors
88Inventor score
Filing activity: Jul 27, 1976 → Apr 15, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| USD618810S1 | Medical patch | General | 71 | Expired |
| US5253022A | Image forming apparatus | Physics | 50 | Expired |
| US5438398A | Image forming apparatus with intermediate transfer member | Physics | 49 | Expired |
| US5331385A | Fixing rotatable member having conductive parting layer and fixing apparatus using same | Physics | 47 | Expired |
| US5179397A | Image forming apparatus with constant voltage and constant current control | Physics | 45 | Expired |
| US5177549A | Image forming apparatus supplied with controllable bias voltage | Physics | 36 | Expired |
| US5235386A | Charging device having charging member, process cartridge and image forming apparatus | Physics | 35 | Expired |
| US6031215A | Image heating device using induction heating for image heating | Electricity | 34 | Expired |
| US5450181A | Fixing device | Physics | 33 | Expired |
| US5715498A | Color image forming apparatus and method for forming a color image corrected for aberration in registration of image stations for each color | Electricity | 32 | Expired |
| US5153654A | Image forming apparatus having transfer member for carrying transfer material | Physics | 31 | Expired |
| US4385829A | Image developing method and device therefor | Performing Operations; Transporting | 29 | Expired |
| US5732314A | Image forming apparatus comprising image bearing member, intermediate image transfer member and secondary image transfer member for facilitating transfer of developed image from intermediate image transfer member to transfer material | Physics | 28 | Expired |
| US4341457A | Electrophotographic apparatus including an electrostatic separation device | Physics | 26 | Expired |
| US5519475A | Image forming apparatus with peripheral speed difference between image bearing and transfer members | Physics | 24 | Expired |
| US5659857A | Image forming method | Physics | 24 | Expired |
| US5970299A | Image heating apparatus | Electricity | 22 | Expired |
| US5159393A | Image forming apparatus having transfer device and image bearing member traveling at different speeds | Physics | 22 | Expired |
| US4370049A | Image developing device | Performing Operations; Transporting | 20 | Expired |
| US5223900A | Transfer roller with a resistance determined in accordance with its peripheral speed | Physics | 20 | Expired |
| US4482240A | Electrophotographic process utilizing electrostatic separation and apparatus therefor | Physics | 20 | Expired |
| US5412455A | Charging device, image forming apparatus and detachably mountable process cartridge having a constant voltage power source feature | Physics | 19 | Expired |
| US6347211B2 | Fixing apparatus preventing leakage of electric current from inner surface of fixing roller | Physics | 18 | Expired |
| US6005594A | Fixing apparatus having a fixing roller with a non-adhesive surface layer | Physics | 18 | Expired |
| US5321482A | Process cartridge and image forming apparatus including a lubricant provided on a cleaning member for cleaning an image bearing member | Physics | 18 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.