Inventor
FUKUSHIMA ISAO
JP39 patents
⚠️ This page may combine multiple inventors who share the name “FUKUSHIMA ISAO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
34 patentsUS4724407AFeb 9, 1988
Integrated filter circuit having switchable selected parallel filter paths
HITACHI LTD27 citations92
US4651067AMar 17, 1987
Apparatus for driving brushless motor
HITACHI LTD47 citations92
US4591924AMay 27, 1986
Multiplex magnetic recording and reproduction system
HITACHI LTD40 citations92
US4607293AAug 19, 1986
Magnetic recording and reproduction system
HITACHI LTD24 citations82
US4358797ANov 9, 1982
Electronic editing control apparatus for a video tape recorder
HITACHI LTD26 citations82
US4190836AFeb 26, 1980
Dynamic drive circuit for light-emitting diodes
HITACHI LTD27 citations82
US4543516ASep 24, 1985
Speed and phase control system
HITACHI LTD23 citations81
US4757394AJul 12, 1988
Auto-tracking apparatus of a magnetic recording/reproducing apparatus
HITACHI LTD8 citations74
US4667120AMay 19, 1987
Integrated filter circuit with variable frequency characteristics
HITACHI LTD7 citations74
US4256975AMar 17, 1981
Limiter circuit for removing nose from demodulated signals
HITACHI LTD17 citations74
US4198541AApr 15, 1980
Signal holding circuit
HITACHI LTD13 citations74
US4197505AApr 8, 1980
Limiter circuit
HITACHI LTD13 citations74
US4713700ADec 15, 1987
A recording circuit having means to automatically set the recording current of a magnetic recording head
HITACHI LTD11 citations73
US4647960AMar 3, 1987
Vertical contour emphasis de-emphasis circuit
HITACHI LTD7 citations72
US4503369AMar 5, 1985
Power supply for plural brushless DC motors
HITACHI LTD19 citations72
US4482926ANov 13, 1984
Method and apparatus for magnetic recording and reproducing
HITACHI LTD11 citations72
US4460953AJul 17, 1984
Signal voltage dividing circuit
HITACHI LTD7 citations72
US4214299AJul 22, 1980
Frequency-voltage converter
HITACHI LTD7 citations72
US4122394AOct 24, 1978
Phase-shifting multiplication type FM signal demodulation circuit
HITACHI LTD7 citations72
US4494056AJan 15, 1985
Motor driving circuit
HITACHI LTD12 citations71
US4605901AAug 12, 1986
Frequency-voltage converter
HITACHI LTD5 citations63
US4590438AMay 20, 1986
Bipolar transistor circuit with FET constant current source
HITACHI LTD3 citations63
US4518901AMay 21, 1985
Motor control apparatus
HITACHI LTD4 citations63
US4307326ADec 22, 1981
Drive system for a motor
HITACHI LTD6 citations63
US4198602AApr 15, 1980
Limiter circuit for limiting pulsive noises
HITACHI LTD4 citations63
US4179650ADec 18, 1979
Variable impedance circuits
HITACHI LTD6 citations63
US4691246ASep 1, 1987
Apparatus for multiplex recording and reproduction of audio and video signals
HITACHI LTD3 citations62
US4146842AMar 27, 1979
Noise muting circuit in fm receiver
HITACHI LTD4 citations62
US4956729ASep 11, 1990
Video signal preamplifier circuit
HITACHI LTD5 citations61
US4521750AJun 4, 1985
Characteristic switching circuit
HITACHI LTD4 citations61
US4338554AJul 6, 1982
Automatic gain control apparatus for a motor servo system
HITACHI LTD4 citations60
US4682096AJul 21, 1987
Switching regulator system for a motor driving circuit
HITACHI LTD1 citations52
US4591798AMay 27, 1986
FM signal demodulation circuit
HITACHI LTD0 citations52
US4774598ASep 27, 1988
Slow-motion device of magnetic recording and reproducing apparatus
HITACHI LTD1 citations48
HITACHI VIDEO ENG
2 patentsHITACHI MICROCUMPUTER ENG
2 patentsUS4737864AApr 12, 1988
Still picture recording system with noise detection and frame counting during shift from reproduction of picture in motion to reproduction of still picture including an intermediate slow motion mode
HITACHI MICROCUMPUTER ENG9 citations71
US4672468AJun 9, 1987
Magnetic recording apparatus with recording of first and second sound signals
HITACHI MICROCUMPUTER ENG3 citations58