Koji Sakamoto
104Patents
19h-index
138Co-inventors
89Inventor score
Filing activity: Mar 1, 1976 → Nov 16, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6122468A | Method and apparatus for forming toner images | Electricity | 55 | Expired |
| US4215930A | Method of maintaining the correct conditions of an electrophotographically duplicated image | Physics | 49 | Expired |
| US4226525A | Electrostatic copying machine | Emerging Cross-Sectional Technologies | 46 | Expired |
| US4200391A | Electrostatographic apparatus comprising document density sensing means | Physics | 45 | Expired |
| US5606408A | Image forming apparatus and cleaning device therefor | Physics | 42 | Expired |
| US4564285A | Developing device having dispersed floating electrodes in a dielectric layer | Physics | 40 | Expired |
| US4862212A | Image forming apparatus | Physics | 40 | Expired |
| US5440373A | Color image forming apparatus | Physics | 38 | Expired |
| US4406535A | Development apparatus | Performing Operations; Transporting | 36 | Expired |
| US5008711A | Image forming apparatus | Physics | 33 | Expired |
| US4306804A | Exposure control and other component control for electrostatic copying machine | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4908661A | Holder device for handling an image carrier of an image forming apparatus | Physics | 26 | Expired |
| US5515145A | Color image forming apparatus having integral multiple length belt | Physics | 25 | Expired |
| US4862209A | Image forming apparatus having a removable image forming process kit | Physics | 23 | Expired |
| US4528937A | Device for forming a developer film | Performing Operations; Transporting | 21 | Expired |
| US4943828A | Replacement of a cartridge usable with image forming equipment | Physics | 21 | Expired |
| US4656964A | Developing device | Physics | 20 | Expired |
| US4195260A | Apparatus for sensing deterioration of developing substance including ferromagnetic carrier and non-magnetic toner particles | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4538898A | Developing device | Physics | 20 | Expired |
| US4575220A | Developing device | Physics | 19 | Expired |
| US4624545A | Developing device with regulated developer supply | Physics | 19 | Expired |
| US4445771A | Developing apparatus for electrostatic photography | Physics | 19 | Expired |
| US4899689A | Developing device with a developing roller and using a single-component developer and method for producing such developing roller | Physics | 18 | Expired |
| US5666275A | Control system for power conversion system | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4561381A | Voltage-controlled developing device | Physics | 17 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.