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KDD CORP
JP49 patents
Top patents by PatentIndex Score
US6532091B1Mar 11, 2003
Optical digital regenerator
KDD CORP92 citations98
US6522667B1Feb 18, 2003
Network interworking device for IP network / ATM network
KDD CORP78 citations98
US6301577B1Oct 9, 2001
Similar document retrieval method using plural similarity calculation methods and recommended article notification service system using similar document retrieval method
KDD CORP95 citations98
US6473459B1Oct 29, 2002
Scene change detector
KDD CORP147 citations97
US6460087B1Oct 1, 2002
Method of transferring file
KDD CORP129 citations97
US6973126B1Dec 6, 2005
Video coding apparatus according to a feature of a video picture
KDD CORP56 citations96
US6526261B1Feb 25, 2003
Control method of transmitting power in cellular system
KDD CORP64 citations96
US6430224B1Aug 6, 2002
Stereo video data coding apparatus
KDD CORP62 citations96
US6459518B1Oct 1, 2002
Optical transmitting apparatus
KDD CORP33 citations93
US6377299B1Apr 23, 2002
Video quality abnormality detection method and apparatus
KDD CORP23 citations93
US6377375B1Apr 23, 2002
Optical wavelength division multiplexed signal amplifying repeater and optical communication transmission line with very large capacity
KDD CORP20 citations93
US6188508B1Feb 13, 2001
Control signal superimposer
KDD CORP35 citations93
US6115173ASep 5, 2000
Optical amplifying transmission system and optical amplifier
KDD CORP30 citations93
US7380015B1May 27, 2008
Apparatus and method for compression-transmitting and decoding picture information and storage medium stored its control programs
KDD CORP16 citations92
US6701373B1Mar 2, 2004
Data transmission apparatus
KDD CORP33 citations92
US6594428B1Jul 15, 2003
Dispersion compensating optical transmission line and system
KDD CORP27 citations92
US6594003B1Jul 15, 2003
Measuring system of transmission characteristics
KDD CORP28 citations92
US6587435B1Jul 1, 2003
Apparatus for high speed communication on asymmetric line
KDD CORP34 citations92
US6351649B1Feb 26, 2002
Mobile communication system
KDD CORP26 citations92
US6348954B1Feb 19, 2002
Optimum motion vector determinator and video coding apparatus using the same
KDD CORP41 citations92
US6118806ASep 12, 2000
Signal synthesis method and apparatus under diversity reception
KDD CORP35 citations92
US6791998B1Sep 14, 2004
Polling period controlling apparatus
KDD CORP51 citations91
US6434288B1Aug 13, 2002
Optical switching system
KDD CORP24 citations91
US6091536AJul 18, 2000
Optical processing device
KDD CORP19 citations91
US6976070B1Dec 13, 2005
Method and apparatus for automatic information filtering using URL hierarchical structure and automatic word weight learning
KDD CORP44 citations90
US6772392B1Aug 3, 2004
Image failure detection unit in redundant duplex transmission
KDD CORP14 citations84
US6701164B1Mar 2, 2004
Mobile communication system with zone-shift control apparatus
KDD CORP14 citations84
US6603505B1Aug 5, 2003
Device for objectively evaluating the quality of a digital transmitted picture
KDD CORP14 citations84
US6556325B1Apr 29, 2003
Optical repeater monitoring system and a method thereof
KDD CORP14 citations84
US6188510B1Feb 13, 2001
Optical amplifying transmission system and optical amplifying repeater
KDD CORP16 citations84
US6535515B1Mar 18, 2003
TCP communication speed improving system
KDD CORP16 citations80
US6956819B1Oct 18, 2005
Method, apparatus and system for evaluating quality-of-service in packet switching network
KDD CORP11 citations74
US6546054B1Apr 8, 2003
Video transmission system using plural links
KDD CORP9 citations74
US6504638B1Jan 7, 2003
Optical amplifying transmission system and optical amplifier
KDD CORP8 citations74
US6374196B1Apr 16, 2002
Method of fault diagnosis based on propagation model
KDD CORP12 citations74
US6795401B1Sep 21, 2004
Band width measuring method and apparatus for a packet switching network
KDD CORP11 citations73
US6768872B1Jul 27, 2004
Optical transmission system, optical transmission line and optical transmitter
KDD CORP9 citations73
US6393189B1May 21, 2002
Optical beam diameter reducer
KDD CORP7 citations73
US6870859B1Mar 22, 2005
Multiplexing system and multiplexing method of tributary signals
KDD CORP9 citations71
US6141532AOct 31, 2000
Transmission line switch-over control system
KDD CORP14 citations70
US6157098ADec 5, 2000
Feed line connection circuit and optical transmission system
KDD CORP14 citations68
US6970467B1Nov 29, 2005
Transfer scheme for speech and voice band signals and ISDN digital signals using reduced transmission bandwidth over ATM
KDD CORP7 citations66
US6020991AFeb 1, 2000
Optical amplifier
KDD CORP13 citations66
US6744990B1Jun 1, 2004
WDM optical transmission system and an optical transmission line thereof
KDD CORP5 citations63
US7801969B2Sep 21, 2010
Apparatus and method for compression-transmitting and decoding picture information and storage medium stored its control programs
KDD CORP4 citations62
US7116715B2Oct 3, 2006
Video coding apparatus according to a feature of a video picture
KDD CORP3 citations62
US6327404B1Dec 4, 2001
Wavelength filter
KDD CORP5 citations62
US6147901ANov 14, 2000
Semiconductor memory operating electrically and optically, retaining information without power supply
KDD CORP6 citations61
US6791951B1Sep 14, 2004
Connection establishment method without specifying called terminal, switched network control device and system using this method
KDD CORP3 citations51