Kazuhiro Fujita
151Patents
18h-index
141Co-inventors
89Inventor score
Filing activity: May 30, 1985 → Jun 27, 2024
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7048388B2 | Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus | Physics | 84 | Expired |
| USD399617S | Electric vacuum cleaner | General | 73 | Expired |
| US7546946B2 | Multifunction, direct thermal recording material | Physics | 71 | Active |
| USD417323S | Electric vacuum cleaner | General | 57 | Expired |
| US7995275B2 | Polarization conversion element, polarization conversion optical system and image projecting apparatus | Electricity | 55 | Active |
| USD430366S | Electric vacuum cleaner | General | 36 | Expired |
| US7561336B2 | Micro-optical device, spatial optical modulator and projector utilizing the micro-optical device | Electricity | 32 | Expired |
| USD368560S | Electric vacuum cleaner | General | 30 | Expired |
| US5060212A | Integrated optical pick-up device | Physics | 24 | Expired |
| USD403475S | Canister vacuum cleaner | General | 24 | Expired |
| US6177667A | Imaging device | Electricity | 22 | Expired |
| US4935911A | Optical head device for recording and reproducing information | Physics | 21 | Expired |
| US7753531B2 | Image display apparatus and projection optical system | Physics | 21 | Active |
| US7077546B2 | Illumination apparatus and liquid crystal projector using the illumination apparatus | Electricity | 20 | Expired |
| US7441908B2 | Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus | Physics | 19 | Expired |
| US4660784A | Tap cartridge | Physics | 19 | Expired |
| USD490953S1 | Electric iron | General | 19 | Expired |
| USD468070S1 | Electric iron | General | 19 | Expired |
| USD734582S1 | Steam iron | General | 18 | Active |
| US6535376B2 | Wrist-carried information device | Electricity | 17 | Expired |
| US5107477A | Integrated optical pick-up device | Physics | 17 | Expired |
| US7049503B2 | Hybrid wind instrument selectively producing acoustic tones and electric tones and electronic system used therein | Physics | 16 | Expired |
| US7631975B2 | Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus | Physics | 16 | Active |
| US7637621B2 | Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus | Physics | 15 | Active |
| US6866404B2 | Illumination apparatus and a liquid crystal projector using the illumination apparatus | Electricity | 15 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.