Masaru Morooka
45Patents
9h-index
26Co-inventors
75Inventor score
Filing activity: Dec 23, 1991 → Mar 21, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6014265A | Zoom optical system | Physics | 29 | Expired |
| US5448411A | Zoom type of finder optical arrangement | Physics | 26 | Expired |
| US6411443B1 | Zoom optical system | Physics | 19 | Expired |
| US9958656B2 | Zoom lens and image pickup apparatus using the same | Physics | 16 | Active |
| US5257129A | Real image type variable magnification viewfinder optical system | Physics | 16 | Expired |
| US7372635B2 | Optical path bending type zoom lens system and image taking apparatus including the same | Physics | 12 | Active |
| US7190529B2 | Zoom lens | Physics | 12 | Expired |
| US5581400A | Finder optical system with low-hygroscopic organic material | Physics | 9 | Expired |
| US5623364A | Vibration-proof optical system | Physics | 9 | Expired |
| US7450316B2 | Zoom lens system and image pickup apparatus using the same | Physics | 9 | Active |
| US5353159A | Three-unit compact zoom lens system | Physics | 7 | Expired |
| US7502171B2 | Optical path bending type zoom lens system and image taking apparatus including the same | Physics | 7 | Active |
| US8654447B2 | Image stabilization zoom lens | Physics | 6 | Active |
| US7151637B2 | Zoom lens and a camera providing the same | Physics | 6 | Expired |
| US10768396B2 | Zoom lens and image pickup apparatus using the same | Physics | 5 | Active |
| US8964302B2 | Image pickup apparatus having zoom lens | Physics | 5 | Active |
| US8564711B2 | Zoom lens and image pickup apparatus having the same | Electricity | 4 | Active |
| US8982484B2 | Imaging optical system, and imaging apparatus incorporating the same | Physics | 4 | Active |
| US6025960A | Zoom optical system | Physics | 4 | Expired |
| US5495367A | Vari-focal viewfinder optical system | Physics | 4 | Expired |
| US8654448B2 | Inner focus lens system and image pickup apparatus using the same | Physics | 4 | Active |
| US6433940B1 | Zoom optical system | Physics | 4 | Expired |
| US6333824A | Zoom lens system consisting of two lens units | Physics | 3 | Expired |
| US5270758A | Waist level finder optical system | Physics | 3 | Expired |
| US5495365A | Finder optical system | Physics | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.