Hitachi Chubu Software, Ltd.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H04K SECRET COMMUNICATION; JAMMING OF COMMUNICATION256
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 2283
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 1446

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5572701 Bus snoop method and apparatus for computer system having CPU with cache and main memory unitApr 19, 94Nov 05, 96[G06F]
5309516 Group cipher communication method and group cipher communication systemJun 15, 93May 03, 94[H04L]
5222139 Cryptographic method and apparatusOct 31, 91Jun 22, 93[H04K]
5218638 Encipher method and decipher methodDec 05, 91Jun 08, 93[H04L, H04K]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6105138 Method and apparatus for controlling electric source in information processing systemExpiredJan 30, 97Aug 15, 00[G06F]
5781434 Control system for communication apparatusExpiredOct 13, 95Jul 14, 98[G05B]
5708827 Spread sheet calculation method and apparatus by extracting an area to be updated by a calculation formulaExpiredSep 18, 95Jan 13, 98[G06F]
5583985 Graphic display processing apparatus for improving speed and efficiency of a window systemExpiredJul 25, 94Dec 10, 96[G06F]
5465299 Electronic document processing system and method of forming digital signatureExpiredNov 29, 93Nov 07, 95[H04K]
5379423 Information life cycle processor and information organizing method using itExpiredJun 01, 93Jan 03, 95[G06F]
5353403 Graphic display processing apparatus and method for improving the speed and efficiency of a window systemExpiredMar 23, 92Oct 04, 94[G06F]
5351294 Limited broadcast systemExpiredMar 23, 93Sep 27, 94[H04K]
4984195 Extended bus controllerExpiredJun 02, 88Jan 08, 91[G06F]

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