Naohiro Kumagai
75Patents
10h-index
95Co-inventors
77Inventor score
Filing activity: Sep 2, 2003 → Jan 10, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7825166B2 | Flexible polyurethane foam, process for its production, and seat for automobile using the flexible polyurethane foam | Chemistry; Metallurgy | 31 | Active |
| US7062194B2 | Charging device, and process cartridge and image forming apparatus including the charging device | Physics | 18 | Expired |
| US7110696B2 | Cleaning unit, process cartridge, and image forming apparatus | Physics | 16 | Expired |
| US7139504B2 | Charging device, and process cartridge and image forming apparatus using the charging device | Physics | 14 | Expired |
| US7149465B2 | Cleaning unit, process cartridge, image forming apparatus, and toner | Physics | 14 | Expired |
| US7272354B2 | Cleaning unit and image forming apparatus having multiple cleaning blades | Physics | 14 | Expired |
| US7295796B1 | Image forming apparatus having a temporary toner holding device and a toner collecting device | Physics | 13 | Expired |
| US7228099B2 | Cleaning device for cleaning a surface of an image support body | Physics | 12 | Expired |
| US7050741B2 | Imaging apparatus, and toner and process cartridge used in the imaging apparatus | Physics | 11 | Expired |
| US7266324B2 | Charging device, and process cartridge and image forming apparatus using the charging device | Physics | 10 | Active |
| US7542712B2 | Lubricant applicator, and image forming apparatus and process cartridge using the lubricant applicator, and method for assembling the process cartridge | Physics | 9 | Active |
| US8487015B2 | Flexible polyurethane foam and process for its production | Chemistry; Metallurgy | 8 | Active |
| US7430377B2 | Image forming apparatus and process cartridge having a detachable unit body having a lubricant applying unit and image carrier mounted thereon | Physics | 8 | Expired |
| US7085528B2 | Cleaning unit, process cartridge, and image forming apparatus | Physics | 7 | Expired |
| US7218877B2 | Charging device, and process cartridge and image forming apparatus including the charging device using the same | Physics | 7 | Expired |
| US7065316B2 | Cleaning unit, process cartridge, image forming apparatus, and toner | Physics | 6 | Expired |
| US7493075B2 | Cleaning device, process cartridge and image forming apparatus | Physics | 6 | Active |
| US7130564B2 | Method and apparatus for image forming capable of removing residual toner without using a toner cleaning system, process cartridge for use in the apparatus and toner used for the image forming | Physics | 5 | Expired |
| US9176457B2 | Image forming apparatus and waste toner conveying device incorporated in same | Physics | 5 | Active |
| US7386257B2 | Imaging apparatus, and toner and process cartridge used in the imaging apparatus | Physics | 4 | Active |
| US8642668B2 | Polymer-dispersed polyol and process for producing flexible polyurethane foam | Chemistry; Metallurgy | 4 | Active |
| US8204400B2 | Charging device capable of efficiently charging image carrier | Physics | 4 | Active |
| US9068693B2 | Lubricant supplying device, image forming apparatus, and process cartridge | Physics | 3 | Active |
| US7831189B2 | Lubricant applying unit, a process cartridge including the same, and an image forming apparatus provided with the process cartridge including the same | Physics | 3 | Active |
| US9081347B2 | Lubricant supplying device, image forming apparatus, and process cartridge | Physics | 3 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.