Koichi Hiroshima
32Patents
18h-index
59Co-inventors
84Inventor score
Filing activity: Jul 14, 1982 → Dec 15, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5450180A | Image forming apparatus having constant current and voltage control in the charging and transfer regions | Physics | 47 | Expired |
| US5179397A | Image forming apparatus with constant voltage and constant current control | Physics | 45 | Expired |
| US5172173A | Image forming device and transfer belt having contact-type electricity feeding means | Physics | 39 | Expired |
| US5264902A | Image forming device | Physics | 33 | Expired |
| US5034777A | Transferring device having charging device with double oxide and voltage control | Physics | 31 | Expired |
| US5732310A | Image forming apparatus having cleaning device for cleaning intermediate transfer member | Physics | 30 | Expired |
| US5010370A | Transfer apparatus and image bearing apparatus using same having transfer means for contacting a backside of a transfer material | Physics | 29 | Expired |
| US5043745A | Light intensity control apparatus | Electricity | 28 | Expired |
| US5809373A | Image forming apparatus which back-transfers residual toner from an intermediate transfer member to a photosensitive drum | Physics | 24 | Expired |
| US6633734B2 | Image forming apparatus having density detecting means | Physics | 24 | Expired |
| US5198863A | Image forming apparatus | Physics | 23 | Expired |
| US5701568A | Image forming apparatus having dielectric constant relationship between image bearing member, intermediate transfer member and contact transfer device | Physics | 22 | Expired |
| US6131010A | Rotatable member having elastic layer and fixing apparatus having said rotatable member | Physics | 22 | Expired |
| US5455603A | Image forming apparatus with feeder control based on pixel conversion status | Physics | 22 | Expired |
| US5285245A | Electrostatic transfer type image forming apparatus with recording material guide for changing direction of recording material separation from image transfer position | Physics | 22 | Expired |
| US5159393A | Image forming apparatus having transfer device and image bearing member traveling at different speeds | Physics | 22 | Expired |
| US5646717A | Image forming apparatus having charging member | Physics | 21 | Expired |
| US5223900A | Transfer roller with a resistance determined in accordance with its peripheral speed | Physics | 20 | Expired |
| US6704521B2 | Image forming apparatus and image forming method | Physics | 15 | Expired |
| US5974281A | Image forming apparatus using intermediate transfer member | Physics | 14 | Expired |
| US4495086A | Method and apparatus for preparing emulsions | Emerging Cross-Sectional Technologies | 14 | Expired |
| US6381419B1 | Image forming apparatus with developer density and developer remaining amount detection features | Physics | 13 | Expired |
| US5999763A | Simultaneous cleaning of residual toner and toner image formation | Physics | 10 | Expired |
| US5412480A | Image forming apparatus with fixer temperature control | Physics | 10 | Expired |
| US5572306A | Image forming apparatus capable of setting fixing temperature corresponding to temperature rising state of heating member | Physics | 10 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.