Koichi Umezawa
15Patents
11h-index
55Co-inventors
75Inventor score
Filing activity: Oct 22, 1993 → Jun 16, 2016
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5491507A | Video telephone equipment | Electricity | 247 | Expired |
| USD669026S1 | Electric vehicle charging station | General | 71 | Active |
| US6290360A | Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same | Physics | 32 | Expired |
| US7207083B2 | Electric vacuum cleaner | Emerging Cross-Sectional Technologies | 32 | Expired |
| USD690694S1 | Magnetic disk storage unit for electronic computer | General | 31 | Active |
| US9061597B2 | Quick charger and quick charging system for electric vehicle | Emerging Cross-Sectional Technologies | 24 | Active |
| US5819185A | Portable satellite communication apparatus | Electricity | 20 | Expired |
| US7276099B2 | Electric vacuum cleaner | Emerging Cross-Sectional Technologies | 18 | Expired |
| USD730894S1 | Magnetic disc storage unit for electronic computer | General | 17 | Active |
| USD733134S1 | Magnetic disk storage unit for electronic computer | General | 13 | Active |
| USD733135S1 | Magnetic disk storage unit for electronic computer | General | 11 | Active |
| US6783245B2 | Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same | Physics | 9 | Expired |
| US6824273B2 | Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same | Physics | 4 | Expired |
| US7152978B2 | Liquid crystal projector, and projection lens unit, optical unit and cooling system for the same | Physics | 3 | Expired |
| USD809409S1 | Breath alcohol content analyzer | General | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.