NTT Data Communications Systems Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H04B TRANSMISSION 2208
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 2283
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 1446
 
  
 
G06K RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS 1197

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6052695 Accurate completion of transaction in cooperative type distributed system and recovery procedure for sameOct 25, 96Apr 18, 00[G06F]
5903553 Enhanced signal collision detection method in wireless communication systemDec 09, 96May 11, 99[H04L]
5640390 Wireless communication network systemJul 01, 94Jun 17, 97[H04L]
5353434 Non-contact IC recording mediumJun 04, 91Oct 04, 94[G06K]
5349463 Optical radio repeater with signal quality detectionMay 28, 93Sep 20, 94[H04B]
5289306 Repeater systemMar 26, 92Feb 22, 94[H04B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6323977 Optical transmitting and receiving apparatusExpiredDec 11, 00Nov 27, 01[H04B]
6182891 Electronic bankbook, and processing system for financial transaction information using electronic bankbookExpiredAug 09, 99Feb 06, 01[G06F]
6029887 Electronic bankbook and processing system for financial transaction information using electronic bankbookExpiredMar 18, 96Feb 29, 00[G06F]
5959754 Optical wireless communication systemExpiredJan 10, 97Sep 28, 99[H04B, H04J]
5752039 Executable file difference extraction/update system and executable file difference extraction methodExpiredNov 21, 94May 12, 98[G06F]
5715462 Updating and restoration method of system fileExpiredJan 18, 96Feb 03, 98[G06F]
5532858 Optical radio transmission system and a method for adjusting optical axes thereofExpiredOct 18, 93Jul 02, 96[H04B]
5204512 Device for controlling communication between electronic information cards and host computer to be kept in secretExpiredOct 26, 90Apr 20, 93[G06K]
5199071 Modem mode matching method with PBX dial-inExpiredJul 10, 90Mar 30, 93[H04M]
5185798 IC card system having a function of authenticating destroyed dataExpiredMar 08, 91Feb 09, 93[H04K, G06K]
D332943 IC card input and output terminalExpiredMay 18, 90Feb 02, 93[]
5179561 Totally self-checking checkerExpiredOct 28, 91Jan 12, 93[H03M]
5153897 Automatically controlling the operation mode of data circuit terminating equipment in a communication systemExpiredJul 10, 90Oct 06, 92[H04L]

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