Hisashi Tokumaru
35Patents
12h-index
27Co-inventors
81Inventor score
Filing activity: Oct 26, 1978 → Nov 8, 2000
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4951075A | Zoom camera | Physics | 60 | Expired |
| US5327290A | Compact size zoom lens system | Physics | 40 | Expired |
| US4516839A | Zoom lens system | Physics | 30 | Expired |
| US4636040A | Zoom lens system | Physics | 21 | Expired |
| US4591235A | Zoom lens system | Physics | 21 | Expired |
| US4903065A | Focus condition detecting device | Physics | 20 | Expired |
| US5105311A | Zoom lens system having high zoom ratio ranging to wide field angle | Physics | 19 | Expired |
| US4846562A | Zoom lens system | Physics | 17 | Expired |
| US4759617A | Zoom lens system | Physics | 17 | Expired |
| US5153777A | Compact-size zoom lens system | Physics | 14 | Expired |
| US4448499A | Image transmitter for copying apparatus of slit exposure scanning type | Physics | 13 | Expired |
| US5122825A | Zoom camera | Physics | 12 | Expired |
| US5274414A | Camera having a varifocal lens | Physics | 11 | Expired |
| US5196877A | Viewfinder framing device for zoom lens camera | Physics | 10 | Expired |
| US4844600A | Zoom lens system | Physics | 9 | Expired |
| US4806003A | Inverted-telephoto type wide angle lens system | Physics | 9 | Expired |
| US4234894A | Reflecting optical system for projection television | Electricity | 9 | Expired |
| US5258802A | Camera system which compensates for defocusing during operation | Physics | 8 | Expired |
| US4449793A | Inverted telephoto type wide angle lens system | Physics | 8 | Expired |
| US4908505A | System for detecting the focus condition of a cata-dioptric lens and interchangeable lens for use therewith | Physics | 8 | Expired |
| US4794416A | Focus detection apparatus | Physics | 7 | Expired |
| US4916473A | Focus detection apparatus | Physics | 6 | Expired |
| US4474459A | Optical projection system | Physics | 6 | Expired |
| US6339510B1 | Camera having a varifocal lens | Physics | 6 | Expired |
| US4764000A | Telephoto lens system with three relatively shiftable lens groups | Physics | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.