Akira Hirota
45Patents
10h-index
50Co-inventors
78Inventor score
Filing activity: Feb 2, 1970 → Feb 4, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4536795A | Video memory device | Electricity | 28 | Expired |
| US4682251A | Video signal reproducing apparatus having a noise reduction circuit | Electricity | 21 | Expired |
| US4178606A | Color video signal recording and/or reproducing system | Electricity | 18 | Expired |
| US4246615A | System for recording and/or reproducing an audio signal which has been converted into a digital signal | Physics | 17 | Expired |
| US5051846A | Magnetic video tape recording and reproducing apparatus | Electricity | 13 | Expired |
| US4607285A | Noise reducing system for video signal | Electricity | 13 | Expired |
| US4626927A | Recording and reproducing apparatus for recording and reproducing a carrier chrominance signal with pre-emphasis and de-emphasis | Electricity | 13 | Expired |
| US4618893A | Noise reducing system for video signal | Electricity | 13 | Expired |
| US4563704A | Noise reduction circuit for a video signal | Electricity | 12 | Expired |
| US4587576A | Video signal processing apparatus with pre-emphasis and de-emphasis for use in a recording and reproducing system | Electricity | 12 | Expired |
| US4295171A | System for controlling rotation of rotating structure | Electricity | 10 | Expired |
| US4246616A | System for reproducing a video signal in a slow motion or still picture reproduction | Electricity | 10 | Expired |
| US4068257A | Color video signal recording and/or reproducing system | Electricity | 10 | Expired |
| US4414586A | Pilot signal recording and reproducing system | Physics | 10 | Expired |
| US5940661A | Image forming apparatus with a charging member which removes smears on an image forming member | Physics | 9 | Expired |
| US4490749A | Color video signal recording and/or reproducing system | Electricity | 8 | Expired |
| US4342053A | Video signal, speed-change reproducing system | Electricity | 8 | Expired |
| US4558353A | Circuit for reducing noise in a carrier chrominance signal | Electricity | 7 | Expired |
| US4486789A | Magnetic recording and/or reproducing apparatus | Physics | 7 | Expired |
| US4639805A | Combination of reproducing heads and a rotary transformer device | Physics | 7 | Expired |
| US4364098A | Multiple-channel rotary transformer circuit in a magnetic recording and/or reproducing apparatus | Physics | 7 | Expired |
| US7347579B2 | Buckle apparatus and seat belt apparatus | Emerging Cross-Sectional Technologies | 6 | Active |
| US4682250A | Apparatus for recording a video signal sampled at frequency f.sub.s and reproducing the video signal as a signal essentially sampled at frequency 2f.sub.s | Electricity | 6 | Expired |
| US4402022A | Tracking control system in a magnetic reproducing apparatus | Physics | 6 | Expired |
| US4476501A | Audio signal recording and/or reproducing system for eliminating audio crosstalk | Physics | 6 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.