Yoshio Ishigaki
26Patents
11h-index
42Co-inventors
71Inventor score
Filing activity: Dec 30, 1974 → Apr 12, 1993
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4694406A | Apparatus for displaying scrolling images | Physics | 43 | Expired |
| US4206388A | Current control circuit for horizontal deflection coil of television receiver | Electricity | 33 | Expired |
| US4339792A | Voltage regulator using saturable transformer | Electricity | 31 | Expired |
| US4242714A | Current control circuit | Electricity | 29 | Expired |
| US4850536A | Liquid ejection apparatus | Physics | 25 | Expired |
| US4322855A | Remote control apparatus | Electricity | 20 | Expired |
| US4358769A | Loop antenna apparatus with variable directivity | Electricity | 19 | Expired |
| US4280139A | Muting circuit for a television receiver | Electricity | 18 | Expired |
| US4170785A | Video signal reproducing apparatus with electron beam scanning velocity modulation | Electricity | 14 | Expired |
| US4012771A | Apparatus for recording and/or reproducing color video signals | Electricity | 13 | Expired |
| US3968514A | Magnetic recording and/or reproducing apparatus | Electricity | 11 | Expired |
| US4223342A | Circuit for improving the frequency characteristic of a color television signal | Electricity | 10 | Expired |
| US4570165A | Adjustable loop and dipole antenna | Electricity | 9 | Expired |
| US4338606A | Antenna system with variable directivity | Electricity | 8 | Expired |
| US4101928A | Color television receiver | Electricity | 6 | Expired |
| US4083019A | Current controlled emitter coupled multivibrator | Electricity | 6 | Expired |
| US3988598A | Multipurpose semiconductor circuits utilizing a novel semiconductor device | Electricity | 5 | Expired |
| US3976951A | Gain control circuits utilizing a novel semiconductor device | Electricity | 5 | Expired |
| US3980900A | Multipurpose switching circuits utilizing a novel semiconductor device | Electricity | 5 | Expired |
| US4081837A | Undesired signal canceller | Electricity | 5 | Expired |
| US5289152A | Permanent magnet magnetic circuit | Electricity | 3 | Expired |
| US4021749A | Signal amplifying circuit | Electricity | 3 | Expired |
| US4322742A | Method and apparatus for improving the sharpness of a video picture | Electricity | 1 | Expired |
| USRE29975E | Magnetic recording and/or reproducing system | General | 1 | Expired |
| US4390818A | Television receiver | Electricity | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.