Inventor
SHIBUTANI MAKOTO
JP25 patents
⚠️ This page may combine multiple inventors who share the name “SHIBUTANI MAKOTO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
20 patentsUS5400391AMar 21, 1995
Mobile communication system
NEC CORP228 citations98
US5847852ADec 8, 1998
Optical network
NEC CORP18 citations92
US5023946AJun 11, 1991
Polarization diversity optical heterodyne receiver with phase adjustment of two I.F. signals for control of a local optical source
NEC CORP26 citations92
US4972515ANov 20, 1990
Polarization diversity receiver having little deteriorated sensitivity despite use of a square-law demodulator having a restricted dynamic range
NEC CORP22 citations82
US5373152ADec 13, 1994
Resonance-type optical receiver circuit having a maximum amplifier input controlled by using an amplifier feedback and its method of receiving
NEC CORP15 citations81
US5138476AAug 11, 1992
Polarization deversity heterodyne receiver of a baseband combining type in which i.e. signals are adjusted by negative feedback from a device output signal
NEC CORP11 citations74
US5771111AJun 23, 1998
Optical network
NEC CORP15 citations73
US5751455AMay 12, 1998
Optical transmission system and optical network terminals used therein
NEC CORP14 citations73
US5504826AApr 2, 1996
Optical module for subcarrier multiplexed optical transmission system
NEC CORP14 citations73
US5371354ADec 6, 1994
Resonance-type optical receiver circuit and method of receiving light wave
NEC CORP11 citations73
US5367156ANov 22, 1994
Resonance-type optical receiver and receiving method for low-frequency signals
NEC CORP12 citations73
US5570219AOct 29, 1996
Optical transmitter for subcarrier frequency multiplexed optical transmission system
NEC CORP12 citations69
US8989603B2Mar 24, 2015
Coherent optical receiver and coherent optical receiving method
NEC CORP3 citations63
US7894374B2Feb 22, 2011
Network system, spanning tree configuration method, spanning tree configuration node, and spanning tree configuration program
NEC CORP3 citations63
US7855981B2Dec 21, 2010
Network system, spanning tree configuration method, spanning tree configuration node, and spanning tree configuration program
NEC CORP2 citations63
US7646789B2Jan 12, 2010
Communication system including several communication terminals and server, its communication terminal, its server and data transfer control program
NEC CORP2 citations62
US7200155B2Apr 3, 2007
Communication system capable of efficiently transmitting data from terminals to server
NEC CORP4 citations62
US7783705B2Aug 24, 2010
Frame transfer method and node in Ethernet
NEC CORP0 citations52
US9819415B2Nov 14, 2017
Interference cancellation device and interference cancellation method
NEC CORP0 citations42
US9124372B2Sep 1, 2015
Optical transmission system and optical transmission method
NEC CORP0 citations42