Tahei Ishiwatari
26Patents
9h-index
34Co-inventors
71Inventor score
Filing activity: May 3, 1988 → Jan 5, 2004
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5701554A | Fixing apparatus having controller for setting a target temperature and for estimating the amount of heat transferred to a pressure roller | Physics | 21 | Expired |
| US5950052A | Image forming apparatus | Physics | 18 | Expired |
| US6185380A | Image forming apparatus having independent recording media discharge passages | Physics | 14 | Expired |
| US6078760A | Image forming apparatus having an inverse and re-fixing sub-mode | Physics | 13 | Expired |
| US6459877B1 | Fixing device which prevents damage to a fixing belt | Physics | 11 | Expired |
| US6233424A | Image receiving sheet having particular critical surface tension, viscoelastic, and rockwell hardness characteristics and image receiving apparatus using the same | Emerging Cross-Sectional Technologies | 11 | Expired |
| US6163674A | Developing unit having developing roller with restraining blade | Physics | 10 | Expired |
| US6312788A | Image receiving sheet and image receiving apparatus using the same | Emerging Cross-Sectional Technologies | 9 | Expired |
| US6192209A | Developing unit | Physics | 9 | Expired |
| US4948692A | Combination toner and printer utilizing same | Physics | 8 | Expired |
| US6198893A | Image forming apparatus having a plurality of developing units | Physics | 8 | Expired |
| US6226484A | Developing unit using specific developer composition | Physics | 7 | Expired |
| US6336022B2 | Developing unit | Physics | 7 | Expired |
| US6173139A | Recording medium carrier system having a paper feed unit, a transfer unit, a fixing unit and a paper ejecting unit constructed as independent units | Physics | 7 | Expired |
| US6094554A | Developing unit having developing roller with specific side surface roughness | Physics | 6 | Expired |
| US6408158B1 | Intermediate transfer unit | Physics | 6 | Expired |
| US6151474A | Developing unit using elastic supply roller | Physics | 5 | Expired |
| US6223015A | Recording medium carrier system intermediate transfer unit | Physics | 5 | Expired |
| US6295433A | Developing unit having a conveying fin for loading a supply roller with toner | Physics | 4 | Expired |
| US6731899B2 | Intermediate transfer unit | Physics | 4 | Expired |
| US6792236B2 | Fixing device for an image forming apparatus | Physics | 3 | Expired |
| US6856782B2 | Intermediate transfer unit having a primary and a secondary transfer member | Physics | 3 | Expired |
| US7187893B2 | Image transfer unit having an intermediate transfer belt to which a toner image is applied | Physics | 3 | Expired |
| US6957032B2 | Intermediate transfer unit having a primary transfer member and a secondary transfer roller | Physics | 2 | Expired |
| US7018766B2 | Toner and production process thereof | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.