Fumihiko Yokogawa
52Patents
15h-index
44Co-inventors
84Inventor score
Filing activity: Mar 31, 1978 → Feb 25, 2004
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5608715A | Multi-layered recording disk and recording/reproducing system using the same | Physics | 155 | Expired |
| US4982110A | Clock generator circuit and a synchronizing signal detection method in a sampled format system and a phase comparator circuit suited for generation of the clock | Physics | 35 | Expired |
| US5914920A | Constant angular velocity type optical disk, double density recording method therefor, and reproducing method for such recorded optical disk | Physics | 30 | Expired |
| US5111443A | Optical recording apparatus | Physics | 27 | Expired |
| US4872155A | Clock generator circuit and a synchronizing signal detection method in a sampled format system and a phase comparator circuit suited for generation of the clock | Physics | 23 | Expired |
| US5440532A | Digital signal reproducing apparatus for reproducing digital signals from a recording medium | Physics | 23 | Expired |
| US5987066A | Digital data transmitting method | Electricity | 22 | Expired |
| US5280462A | Disc playing and recording apparatus having a pair of heads controlled to prevent interruptions during play | Physics | 22 | Expired |
| US4540897A | Digital modulation signal reading device | Physics | 21 | Expired |
| US4908811A | Method and apparatus for data recording and reproducing with error reduction | Physics | 21 | Expired |
| US5646932A | Optical disk, tracking error signal generating apparatus, and tracking control apparatus | Physics | 19 | Expired |
| US4937809A | Optical information recording apparatus | Physics | 17 | Expired |
| US4929917A | Phase-locked loop circuit | Physics | 17 | Expired |
| US4933922A | Apparatus for generating a tracking error signal | Physics | 16 | Expired |
| US5917857A | Digital modulation apparatus, a digital modulation method, and a recording medium therefor | Physics | 16 | Expired |
| US5065384A | Clock signal generating circuit for a data storing and reproducing system | Physics | 14 | Expired |
| US4701902A | Automatic loading disc player | Physics | 14 | Expired |
| US4637003A | Amplitude modulated high frequency signal detection device | Electricity | 14 | Expired |
| US5434840A | Non-linear reflectance optical information recording layer irradiated by a light beam controlled with an amplitude filter | Physics | 13 | Expired |
| US4974081A | Clock pulse generating circuit | Electricity | 13 | Expired |
| US4860271A | Servo circuit for generating a tracking error signal for optical disk player | Physics | 12 | Expired |
| US5246758A | Optical recording medium | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4879705A | Automatic loading disc player | Physics | 10 | Expired |
| US6463210B1 | Video disc having an aspect ratio information and video disc player having an aspect ratio converting function | Electricity | 10 | Expired |
| US4829502A | Automatic loading disc player | Physics | 10 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.