Inventor
SUGAWARA TOSHIKI
JP49 patents
⚠️ This page may combine multiple inventors who share the name “SUGAWARA TOSHIKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
25 patentsUS6625115B1Sep 23, 2003
Self-healing network, method for transmission line switching thereof, and transmission equipment thereof
HITACHI LTD50 citations96
US6169754B1Jan 2, 2001
Multiplex transmission apparatuses, multiplex transmission networks, and operation method therefor
HITACHI LTD44 citations96
US6144633ANov 7, 2000
Self-healing network, method for transmission line switching thereof, and transmission equipment thereof
HITACHI LTD75 citations96
US6907006B1Jun 14, 2005
Method and apparatus for detecting faults in IP packet communication
HITACHI LTD28 citations93
US6697386B2Feb 24, 2004
Multiplex transmission apparatuses, multiplex transmission networks, and operation method therefor
HITACHI LTD20 citations93
US6094440AJul 25, 2000
Multiplex type transmitting apparatus
HITACHI LTD22 citations93
US8036533B2Oct 11, 2011
Optical transmitter/receiver module
HITACHI LTD29 citations92
US7991290B2Aug 2, 2011
Optical prism and optical transceiver module for optical communications
HITACHI LTD23 citations92
US6850713B2Feb 1, 2005
Optical single sideband transmitter
HITACHI LTD44 citations92
US6219336B1Apr 17, 2001
Terminal multiplexer and method of constructing the terminal multiplexer
HITACHI LTD30 citations91
US6049525AApr 11, 2000
Terminal multiplexer and method of constructing the terminal multiplexer
HITACHI LTD17 citations91
US9154220B2Oct 6, 2015
Large-capacity fiber optical switching device and optical transmission system
HITACHI LTD7 citations84
US8027586B2Sep 27, 2011
Passive optical network system and optical line terminating apparatus
HITACHI LTD11 citations84
US7936991B2May 3, 2011
Optical line terminating apparatus and optical communication system
HITACHI LTD12 citations84
US7061619B2Jun 13, 2006
Chemical substance measuring apparatus using optical waveguides
HITACHI LTD17 citations84
US6785225B1Aug 31, 2004
Communication apparatus and communication system
HITACHI LTD15 citations84
US7518998B2Apr 14, 2009
IP packet communication apparatus
HITACHI LTD7 citations74
US7054265B1May 30, 2006
Communication apparatus and communication system
HITACHI LTD6 citations74
US6775434B2Aug 10, 2004
Variable optical dispersion compensator
HITACHI LTD9 citations74
US6577438B2Jun 10, 2003
Method and apparatus for monitoring and controlling gain tilt in an optical amplifier
HITACHI LTD7 citations74
US6411631B1Jun 25, 2002
Multiplex type transmitting apparatus
HITACHI LTD9 citations74
US9379276B2Jun 28, 2016
Optical interconnection module and optical-electrical hybrid board
HITACHI LTD2 citations63
US7145146B2Dec 5, 2006
Micro-spectroscopic measuring device and micro-chemical system
HITACHI LTD2 citations63
US7386012B2Jun 10, 2008
Multiplex transmission apparatuses, multiplex transmission networks, and operation method therefor
HITACHI LTD0 citations52
US6388804B1May 14, 2002
Optical amplifier
HITACHI LTD1 citations52
MIZUTANI MASAHIKO
4 patentsUS8488965B2Jul 16, 2013
Network system and optical line terminal
MIZUTANI MASAHIKO11 citations84
US8457495B2Jun 4, 2013
Network system, optical network unit and optical line terminal
MIZUTANI MASAHIKO10 citations84
US8331784B2Dec 11, 2012
Network system and optical line terminal
MIZUTANI MASAHIKO19 citations84
US8224135B2Jul 17, 2012
Optical communication system using WDMA and CDMA
MIZUTANI MASAHIKO1 citations52
ADACHI KOICHIRO
3 patentsHITACHI METALS LTD
3 patentsMATSUOKA YASUNOBU
2 patentsUS8437584B2May 7, 2013
Optical I/O array module and its fabrication method
MATSUOKA YASUNOBU33 citations90
US8942520B2Jan 27, 2015
Optical waveguide board having guided structure and method of manufacturing the same, and method of manufacturing optical-electrical hybrid board
MATSUOKA YASUNOBU4 citations72