Inventor
TAKASAKI YOSHITAKA
JP32 patents
Patents
32 patentsUS5042027AAug 20, 1991
Communication network system and method of controlling a communication network
HITACHI LTD369 citations98
US4604745AAug 5, 1986
Method of searching fault locations in digital transmission line
HITACHI LTD59 citations96
US4459698AJul 10, 1984
Variable equalizer
HITACHI LTD79 citations96
US5140453AAug 18, 1992
Optical receiving method utilizing polarization diversity and apparatus for carrying out the same
HITACHI LTD32 citations92
US5121244AJun 9, 1992
Optical subscriber network transmission system
HITACHI LTD53 citations92
US5113524AMay 12, 1992
Quantum state control apparatus, optical receiver and optical communication system
HITACHI LTD40 citations92
US4123242AOct 31, 1978
Apparatus for producing optical fiber
HITACHI LTD32 citations92
US4187479AFeb 5, 1980
Variable equalizer
HITACHI LTD55 citations91
US5815502ASep 29, 1998
Information transmission system with variable transmission rate
HITACHI LTD16 citations82
US5515368AMay 7, 1996
Information transmission system with variable transmission rate
HITACHI LTD16 citations82
US4967410AOct 30, 1990
Method of multiplexing digital signals and apparatus therefor
HITACHI LTD20 citations82
US4504943AMar 12, 1985
Time domain multiplexer
HITACHI LTD25 citations82
US4410980AOct 18, 1983
Time division multiplexing system
HITACHI LTD24 citations82
US4004253AJan 18, 1977
Variable equalizer
HITACHI LTD23 citations81
US4723312AFeb 2, 1988
Light emitting diode driver circuit
HITACHI LTD24 citations80
US5175639ADec 29, 1992
Optical subscriber network transmission system
HITACHI LTD19 citations74
US5121381AJun 9, 1992
Optical switching apparatus for digital signal cross connection and method of interswitch optical transmission of digital signals
HITACHI LTD13 citations74
US5023604AJun 11, 1991
Communication system
HITACHI LTD13 citations74
US4970719ANov 13, 1990
Digital signal multiplexing apparatus
HITACHI LTD9 citations74
US4320527AMar 16, 1982
Bit synchronizing system for pulse signal transmission
HITACHI LTD14 citations74
US4204176AMay 20, 1980
Variable equalizer
HITACHI LTD7 citations73
US4503546AMar 5, 1985
Pulse signal transmission system
HITACHI LTD11 citations72
US4122417AOct 24, 1978
Variable equalizer
HITACHI LTD12 citations72
US4080580AMar 21, 1978
Variable equalizer
HITACHI LTD9 citations72
US4330856AMay 18, 1982
Digital signal transmission system including means for converting asynchronous signals to the operating speed of a transmission line
HITACHI LTD14 citations70
US5430733AJul 4, 1995
Digital transmission system for multiplexing and demultiplexing signals
HITACHI LTD5 citations63
US5418405AMay 23, 1995
Installation path network for distribution area
HITACHI LTD3 citations63
US5369517ANov 29, 1994
Optical subscriber network transmission system
HITACHI LTD3 citations63
US4796281AJan 3, 1989
Digital signal transmission system
HITACHI LTD4 citations63
US4262263AApr 14, 1981
Variable equalizer
HITACHI LTD2 citations63
US5414739AMay 9, 1995
Transmission system constituted of multistage reproduction nodes
HITACHI LTD6 citations62
US4097824AJun 27, 1978
Variable equalizer
HITACHI LTD2 citations62