Kazuhiko Umemura
46Patents
21h-index
91Co-inventors
88Inventor score
Filing activity: Nov 17, 1987 → Oct 10, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7321744B2 | Developer container, developer supplying device, and image forming apparatus | Emerging Cross-Sectional Technologies | 89 | Expired |
| US7480476B2 | Developer container, developer supplying device, and image forming apparatus | Emerging Cross-Sectional Technologies | 86 | Active |
| US7519317B2 | Developer container, developer supplying device, and image forming apparatus | Emerging Cross-Sectional Technologies | 62 | Active |
| US8005406B2 | Developer container, developer supplying device, and image forming apparatus | Emerging Cross-Sectional Technologies | 59 | Active |
| US7835673B2 | Developer container, developer supplying device, and image forming apparatus | Emerging Cross-Sectional Technologies | 56 | Active |
| US7697870B2 | Developer container, developer supplying device, and image forming apparatus | Emerging Cross-Sectional Technologies | 53 | Active |
| US8195070B2 | Developer container, developer supplying device, and image forming apparatus | Emerging Cross-Sectional Technologies | 47 | Active |
| US5026621A | Toner for electrophotography | Physics | 39 | Expired |
| US6447973B1 | Liquid developer for developing electrostatic image and image forming method | Physics | 38 | Expired |
| US4950573A | Toner for developing latent electrostatic images | Physics | 35 | Expired |
| US5740507A | Densely packed toner container and method of producing the same | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5189102A | Method for producing a vinyl resin using a silicon oil solvent | Chemistry; Metallurgy | 33 | Expired |
| US6493529B1 | Charging device with walls surrounding the electrodes which reduce ozone emissions | Physics | 32 | Expired |
| US7076192B2 | Powder conveying device and image forming apparatus using the same | Emerging Cross-Sectional Technologies | 31 | Expired |
| US7024133B2 | Image forming apparatus using a user installable process cartridge, a method of arranging the process cartridge, and the process cartridge itself | Physics | 30 | Expired |
| US7398038B2 | Image forming apparatus using a toner container and a process cartridge | Physics | 29 | Expired |
| US6818369B2 | Toner for electrostatic image development and image forming method and apparatus using the toner | Physics | 28 | Expired |
| US6828075B2 | Carrier for electrophotography and developer using the same | Physics | 24 | Expired |
| US7136610B2 | Image forming apparatus using installable process cartridge, method of positioning process cartridge, and process cartridge itself | Physics | 23 | Expired |
| US5061587A | Toner for electrophotography including fluorine contained graft copolymer | Physics | 22 | Expired |
| US7172844B2 | Toner for electrophotography, and image forming process, process cartridge and image forming apparatus using the same | Physics | 22 | Expired |
| US7258959B2 | Toner for electrophotography and image forming apparatus | Physics | 21 | Expired |
| US6770411B2 | Negatively chargeable toner | Physics | 21 | Expired |
| US7169525B2 | Toner, developer, image forming apparatus, process cartridge and image forming process | Physics | 20 | Expired |
| US5952048A | Ink composition and recording method using the same | Performing Operations; Transporting | 20 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.