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DDI CORP
JP18 patents
Top patents by PatentIndex Score
US6775478B2Aug 10, 2004
Optical TDM multiplexer, optical TDM demultiplexer, WDM/TDM converter and TDM/WDM converter
DDI CORP40 citations93
US7212972B2May 1, 2007
Audio features description method and audio video features description collection construction method
DDI CORP23 citations92
US6961316B2Nov 1, 2005
Mobile communication system having adaptively assigned packet rate
DDI CORP28 citations92
US6836484B2Dec 28, 2004
Wireless packet communication method and system for transmitting packets between base station and radio terminal station
DDI CORP41 citations92
US6690928B1Feb 10, 2004
Mobile communication system for forecasting communication traffic
DDI CORP37 citations92
US6898423B2May 24, 2005
Group communication system for mobile terminals having real time communication capabilities
DDI CORP35 citations91
US7010585B2Mar 7, 2006
DNS server, DHCP server, terminal and communication system
DDI CORP23 citations89
US7152063B2Dec 19, 2006
Scheme for filtering documents on network using relevant and non-relevant profiles
DDI CORP19 citations82
US6785248B2Aug 31, 2004
Spread spectrum communication method and spread spectrum communication apparatus
DDI CORP18 citations82
US6763059B2Jul 13, 2004
Spread spectrum signal demodulator
DDI CORP11 citations74
US6515793B2Feb 4, 2003
Optical waveform shaper
DDI CORP10 citations74
US6782201B2Aug 24, 2004
Four fiber ring network optical switching circuit using branched inputs
DDI CORP7 citations73
US6748178B2Jun 8, 2004
Optical transmission line
DDI CORP11 citations73
US6377388B1Apr 23, 2002
Optical signal processor
DDI CORP7 citations71
US7010504B2Mar 7, 2006
Competitive buying and selling system and its control method
DDI CORP6 citations63
US6741810B2May 25, 2004
Signal demultiplexing device and signal routing device in high speed transmission system
DDI CORP5 citations63
US6690732B2Feb 10, 2004
Scene characteristics detection type video encoding apparatus
DDI CORP4 citations63
US7010592B2Mar 7, 2006
Method for collecting statistical traffic data
DDI CORP3 citations61