Hirofumi Ogawa
44Patents
11h-index
74Co-inventors
78Inventor score
Filing activity: May 5, 1983 → Nov 15, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6636709B2 | Fixing device having temperature detecting member and image forming apparatus using said fixing device | Physics | 73 | Expired |
| US7509085B2 | Image forming apparatus, fixing apparatus and toner | Physics | 70 | Active |
| US6628916B2 | Fixing device preventing rubbing of toner image | Physics | 67 | Expired |
| US7022944B2 | Image forming apparatus preventing excessive increase in temperature of fixing device | Physics | 58 | Expired |
| US7546049B2 | Image forming device with a control means to correct the fixing control temperature | Physics | 56 | Active |
| US6881927B2 | Image forming apparatus preventing excessive increase in temperature of fixing device | Physics | 56 | Expired |
| US6785505B2 | Fixing device preventing rubbing of toner image | Physics | 54 | Expired |
| US5233265A | Photoconductive imaging apparatus | Emerging Cross-Sectional Technologies | 34 | Expired |
| US4888521A | Photoconductive device and method of operating the same | Electricity | 25 | Expired |
| US4952839A | Photoconductive device and method of operating the same | Electricity | 25 | Expired |
| US6070695A | Silencer | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US5305559A | Method of grinding core blank for magnetic heads, using markers for determining grinding depth for nominal magnetic gap depth | Physics | 9 | Expired |
| US5335140A | Drawer-type circuit interrupter | Electricity | 9 | Expired |
| US4556817A | Photoelectric conversion apparatus | Electricity | 5 | Expired |
| US8085081B2 | Semiconductor device for output of pulse waveforms | Electricity | 5 | Active |
| US10035410B2 | Parting seal and sealing structure of parting portion | Performing Operations; Transporting | 4 | Active |
| US4626885A | Photosensor having impurity concentration gradient | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4609846A | Image pick-up tube having collector and balance electrodes | Electricity | 3 | Expired |
| US10513169B2 | Weather strip for automobile | Performing Operations; Transporting | 3 | Active |
| US8225941B2 | Hollow fiber membrane for treating liquids | Performing Operations; Transporting | 3 | Active |
| US8479450B2 | Weather strip having a drainage structure | Performing Operations; Transporting | 2 | Active |
| US5625457A | Method and apparatus for non-contact measurement of relative displacement | Physics | 2 | Expired |
| US5218264A | Image pick-up tube and apparatus having the same | Electricity | 2 | Expired |
| US10081232B2 | Weatherstrip assembly for a vehicle | Performing Operations; Transporting | 2 | Active |
| US4636682A | Image pickup tube | Electricity | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.