KDD CORPORATION

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H01S DEVICES USING STIMULATED EMISSION389
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 2283
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 1446
 
  
 
H04B TRANSMISSION 1209
 
  
 
H04J MULTIPLEX COMMUNICATION 1124
 
  
 
H04N PICTORIAL COMMUNICATION, e.g. TELEVISION 1241

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
7801969 Apparatus and method for compression-transmitting and decoding picture information and storage medium stored its control programsOct 06, 05Sep 21, 10[G06F]
6867908 Optical amplifier having various control circuitryMar 31, 03Mar 15, 05[H01S]
6614588 Optical amplifier having various control circuitryNov 29, 00Sep 02, 03[H01S]
6603505 Device for objectively evaluating the quality of a digital transmitted pictureAug 31, 00Aug 05, 03[H04N]
6587435 Apparatus for high speed communication on asymmetric lineMar 05, 99Jul 01, 03[H04L]
6188508 Control signal superimposerJun 03, 99Feb 13, 01[H01S]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7380015 Apparatus and method for compression-transmitting and decoding picture information and storage medium stored its control programsExpiredSep 07, 00May 27, 08[G06F]
7116715 Video coding apparatus according to a feature of a video pictureExpiredApr 03, 02Oct 03, 06[H04B]
6976070 Method and apparatus for automatic information filtering using URL hierarchical structure and automatic word weight learningExpiredFeb 14, 00Dec 13, 05[G06F]
6973126 Video coding apparatus according to a feature of a video pictureExpiredFeb 29, 00Dec 06, 05[H04B]
6970467 Transfer scheme for speech and voice band signals and ISDN digital signals using reduced transmission bandwidth over ATMExpiredJan 27, 99Nov 29, 05[H04L, H04J]
6956819 Method, apparatus and system for evaluating quality-of-service in packet switching networkExpiredMay 18, 00Oct 18, 05[H04J]
6870859 Multiplexing system and multiplexing method of tributary signalsExpiredMar 03, 00Mar 22, 05[H04Q]
6801720 Optical signal quality supervisory deviceExpiredApr 28, 00Oct 05, 04[H04B]
6795401 Band width measuring method and apparatus for a packet switching networkExpiredApr 19, 00Sep 21, 04[G08C, G06F, G01R, H04J]
6791951 Connection establishment method without specifying called terminal, switched network control device and system using this methodExpiredApr 18, 00Sep 14, 04[H04B]
6791998 Polling period controlling apparatusExpiredFeb 22, 99Sep 14, 04[H04L]
6772392 Image failure detection unit in redundant duplex transmissionExpiredJun 02, 00Aug 03, 04[H03M, G06F]
6768872 Optical transmission system, optical transmission line and optical transmitterExpiredSep 25, 00Jul 27, 04[H04J]
6744990 WDM optical transmission system and an optical transmission line thereofExpiredNov 05, 99Jun 01, 04[H04B]
6701164 Mobile communication system with zone-shift control apparatusExpiredJun 20, 00Mar 02, 04[H04B]
6701373 Data transmission apparatusExpiredJul 10, 00Mar 02, 04[G06F]
6629121 Surface acoustic wave-matched filter and differential detector for demodulating spread spectrum signalsExpiredOct 07, 99Sep 30, 03[G06G]
6594003 Measuring system of transmission characteristicsExpiredApr 20, 00Jul 15, 03[G01N]
6594428 Dispersion compensating optical transmission line and systemExpiredMar 08, 00Jul 15, 03[G02B]
6556325 Optical repeater monitoring system and a method thereofExpiredFeb 18, 00Apr 29, 03[H04B]

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