Nobuyuki Okubo
27Patents
12h-index
34Co-inventors
77Inventor score
Filing activity: Jul 13, 1989 → Sep 20, 2007
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7273686B2 | Toner | Physics | 43 | Expired |
| US7288354B2 | Toner | Physics | 38 | Expired |
| US7351509B2 | Toner | Physics | 31 | Expired |
| US5489498A | Toner for developing electrostatic image and method of manufacturing resin composition | Physics | 26 | Expired |
| US5744276A | Toner for developing electrostatic image containing higher and lower molecular weight polymer components | Physics | 25 | Expired |
| US5364720A | Magnetic developer for developing electrostatic images | Physics | 24 | Expired |
| US5750302A | Magnetic toner for developing electrostatic image, image forming process, and process cartridge | Physics | 21 | Expired |
| US6007957A | Magnetic toner, image forming method and process cartridge | Physics | 20 | Expired |
| US7745089B2 | Process for producing toner, and toner | Physics | 18 | Active |
| US7184589B2 | Image compression apparatus | Electricity | 18 | Expired |
| US5858593A | Magnetic toner, apparatus unit and image forming method | Physics | 15 | Expired |
| US6426169B1 | Toner containing azo iron compound | Physics | 13 | Expired |
| US6589701B2 | Dry toner, image forming method and process cartridge | Physics | 11 | Expired |
| US6458499B1 | Toner having hydrocarbon wax with specific ester value and hydroxyl value | Physics | 11 | Expired |
| US5942366A | Image forming method employing toner containing higher and lower molecular weight polymer components | Physics | 11 | Expired |
| US5962176A | Toner for developing electrostatic image, image forming method and process-cartridge | Physics | 10 | Expired |
| US6673506B2 | Toner production process | Physics | 10 | Expired |
| US7306889B2 | Process for producing toner, and toner | Physics | 9 | Expired |
| US6090515A | Toner for developing electrostatic image, image forming method and process cartridge | Physics | 9 | Expired |
| US5840459A | Toner for developing electrostatic images and process for production thereof | Physics | 8 | Expired |
| US5854365A | Toner for developing electrostatic image and method of manufacturing resin composition | Physics | 6 | Expired |
| US6630275B2 | Magnetic toner and process cartridge | Physics | 5 | Expired |
| US6810217B2 | Process cartridge | Physics | 4 | Expired |
| US6365314B1 | Toner for developing electrostatic image, image forming method and process cartridge | Physics | 3 | Expired |
| US7327881B2 | Image reading apparatus | Physics | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.