Inventor
IMOTO KATSUYUKI
JP34 patents
⚠️ This page may combine multiple inventors who share the name “IMOTO KATSUYUKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
20 patentsUS4856859AAug 15, 1989
Optical waveguide and method for fabricating the same
HITACHI LTD57 citations96
US4601535AJul 22, 1986
Optical coupling system with intermediate coupling medium
HITACHI LTD38 citations93
US5140453AAug 18, 1992
Optical receiving method utilizing polarization diversity and apparatus for carrying out the same
HITACHI LTD32 citations92
US5111323AMay 5, 1992
Optical switching system
HITACHI LTD50 citations92
US4909584AMar 20, 1990
Optical multi/demultiplexer and optical module using the same
HITACHI LTD34 citations92
US4904037AFeb 27, 1990
Waveguide type optical device with thermal compensation layers
HITACHI LTD32 citations92
US4880289ANov 14, 1989
Two-way optical transmission system
HITACHI LTD50 citations92
US4822128AApr 18, 1989
Optical fiber star coupler and method of manufacturing the same
HITACHI LTD32 citations92
US4801190AJan 31, 1989
Two-way optical fiber transmission network
HITACHI LTD44 citations92
US4790614ADec 13, 1988
Optical filter and optical device using same
HITACHI LTD35 citations92
US4756587AJul 12, 1988
Optical multi/demultiplexer
HITACHI LTD29 citations92
US4123242AOct 31, 1978
Apparatus for producing optical fiber
HITACHI LTD32 citations92
US3973828AAug 10, 1976
Optical wave guide
HITACHI LTD48 citations92
US4726643AFeb 23, 1988
Optical star coupler and method for manufacturing the same
HITACHI LTD34 citations91
US4842359AJun 27, 1989
Optical star coupler and method of manufacturing the same
HITACHI LTD15 citations81
US4101300AJul 18, 1978
Method and apparatus for drawing optical fiber
HITACHI LTD24 citations81
US4970713ANov 13, 1990
Waveguide type optical multiplexer/demultiplexer with a wave guide regulating function
HITACHI LTD15 citations74
US4871221AOct 3, 1989
Optical waveguide device
HITACHI LTD18 citations74
US4259101AMar 31, 1981
Method for producing optical fiber preform
HITACHI LTD15 citations73
US4953934ASep 4, 1990
Waveguide type light merging and branching device
HITACHI LTD9 citations71
HITACHI CABLE
12 patentsUS5916460AJun 29, 1999
Method and apparatus for dicing a substrate
HITACHI CABLE167 citations99
US5742722AApr 21, 1998
Rare earth element-doped multiple-core optical fiber and optical systems using the samefield of the invention
HITACHI CABLE71 citations96
US5206925AApr 27, 1993
Rare earth element-doped optical waveguide and process for producing the same
HITACHI CABLE149 citations96
US5712941AJan 27, 1998
Rare earth element-doped multiple-core optical fiber and method for fabricating the same
HITACHI CABLE42 citations92
US5706124AJan 6, 1998
Rare earth element-doped optical fiber amplifier
HITACHI CABLE20 citations92
US5703987ADec 30, 1997
Rare earth element-doped multiple-core optical fiber and optical systems using the same field of the invention
HITACHI CABLE26 citations92
US5570448AOct 29, 1996
Rare earth element-doped multiple-core optical fiber, method for fabricating the same, and optical amplifier using the same
HITACHI CABLE23 citations92
US7035518B2Apr 25, 2006
Polymer waveguides and process for producing the same
HITACHI CABLE10 citations74
US5475777ADec 12, 1995
Optical device with a pig tail optical fiber and its production method
HITACHI CABLE11 citations74
US5134672AJul 28, 1992
Optical waveguide type star coupler
HITACHI CABLE13 citations73
US5190364AMar 2, 1993
Optical star coupler and method for manufacturing the same
HITACHI CABLE11 citations70
US6830818B2Dec 14, 2004
Polymer material and polymer film
HITACHI CABLE0 citations51