Inventor
ISHIYAMA SHOZO
JP13 patents
⚠️ This page may combine multiple inventors who share the name “ISHIYAMA SHOZO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
KONISHIROKU PHOTO IND
7 patentsUS4449792AMay 22, 1984
Large-aperture single lens with aspherical surfaces
KONISHIROKU PHOTO IND38 citations92
USRE34455ENov 23, 1993
Large-aperture single lens with aspherical surfaces
KONISHIROKU PHOTO IND9 citations74
US4437732AMar 20, 1984
Wide magnification-variable range zoom lens system
KONISHIROKU PHOTO IND20 citations73
US4501475AFeb 26, 1985
Zoom lens
KONISHIROKU PHOTO IND19 citations72
US4498741AFeb 12, 1985
Compact, wide magnification-variable zoom lens system
KONISHIROKU PHOTO IND4 citations62
US4350416ASep 21, 1982
Compact zoom lens
KONISHIROKU PHOTO IND4 citations62
US4830475AMay 16, 1989
Focusing means for a zoom lens group
KONISHIROKU PHOTO IND6 citations61
GAKKEN CO LTD
4 patentsUS5190287AMar 2, 1993
Jigsaw puzzle toy using blocks
GAKKEN CO LTD70 citations95
US4667962AMay 26, 1987
Children's block toy
GAKKEN CO LTD17 citations73
US4258477AMar 31, 1981
Multiplication study device
GAKKEN CO LTD14 citations73
US4273541AJun 16, 1981
Clock for educational purposes
GAKKEN CO LTD6 citations62