Hitachi Computer Engineering Co., Ltd.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 4443
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 2283
 
  
 
B23P OTHER WORKING OF METAL; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS 155
 
  
 
H01J ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS 1127
 
  
 
H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF 1101
 
  
 
H03K PULSE TECHNIQUE 1130
 
  
 
H03L AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES 179
 
  
 
H04B TRANSMISSION 1209
 
  
 
H04K SECRET COMMUNICATION; JAMMING OF COMMUNICATION157
 
  
 
H05K PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS 1155

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6014406 Frequency-hopped wireless communication system and mobile wireless terminalApr 24, 96Jan 11, 00[H04L, H04B, H04K]
5982762 Wireless LAN system, base station device and wireless terminal device therefor, and method for relaying information frameMar 19, 96Nov 09, 99[H04L]
5842042 Data transfer control method for controlling transfer of data through a buffer without causing the buffer to become empty or overflowDec 18, 96Nov 24, 98[G06F]
5638012 Write driver circuitOct 18, 95Jun 10, 97[H03K, H02M]
5623607 Data transfer control method for controlling transfer of data through a buffer without causing the buffer to become empty or overflowSep 29, 94Apr 22, 97[G06F]
5603003 High speed file access control method and computer system including a plurality of storage subsystems connected on a busMar 01, 93Feb 11, 97[G06F]
5548724 File server system and file access control method of the sameMar 21, 94Aug 20, 96[H01J]
5386623 Process for manufacturing a multi-chip moduleNov 07, 91Feb 07, 95[B23P, H05K]
5373254 Method and apparatus for controlling phase of a system clock signal for switching the system clock signalJan 15, 93Dec 13, 94[H03L]
5327535 Magnetic recording control apparatusAug 25, 92Jul 05, 94[G06F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6148415 Backup switching control system and methodExpiredJun 10, 94Nov 14, 00[G11C, H02H]
5761435 Multiprocessor bridge having storage for spanning tree operation mode information indicating whether each port of the bridge is operable under spanning tree protocolExpiredMar 10, 95Jun 02, 98[G06F]
5745972 Method of producing parts/substrate assembliesExpiredJun 07, 95May 05, 98[B23P, H05K]
5745444 Method of controlling recording information on an optical disk using replacement control informationExpiredDec 18, 95Apr 28, 98[G11B]
5710903 Data processing system provided with an address translation lookaside buffer capable of quick partial purge operationExpiredMar 09, 95Jan 20, 98[G06F]
5671354 Method of assisting server access by use of user authentication information held in one of servers and a method of assisting management user account for use of serversExpiredFeb 23, 96Sep 23, 97[G06F]
5543607 Self check-out system and POS systemExpiredNov 14, 94Aug 06, 96[G06K]
5513427 System for producing parts/substrate assembliesExpiredJan 12, 94May 07, 96[B23P]
5497467 Vector data buffer and method of reading data items from a banked storage without changing the data sequence thereofExpiredAug 08, 91Mar 05, 96[G06F]
5432514 Method and apparatus for detecting abnormality in analog-to-digital converterExpiredDec 09, 93Jul 11, 95[H03M]
5355461 Method of and apparatus for selecting an origin address for use in translating a logical address in one of a plurality of virtual address spaces to a real address in a real address spaceExpiredSep 24, 90Oct 11, 94[G06F]
5351040 Control system for configuring ring LAN with improved reconfiguration operationExpiredSep 05, 91Sep 27, 94[H04Q]
5329690 Printed circuit board assembling systemExpiredDec 07, 92Jul 19, 94[B23P]
5327425 Network synchronization control system and control methodExpiredSep 10, 92Jul 05, 94[H04J]
5295251 Method of accessing multiple virtual address spaces and computer systemExpiredSep 21, 90Mar 15, 94[G06F]
5274280 Semiconductor integrated circuit device having separate supply voltages for the logic stage and output stageExpiredSep 13, 91Dec 28, 93[H03K]
5268769 Image signal decoding system for decoding modified Huffman codes at high speedsExpiredAug 01, 91Dec 07, 93[H04N, H03M]
5247695 Vector processor with byte access of memoryExpiredJun 27, 90Sep 21, 93[G06F]
5231585 Computer-integrated manufacturing system and methodExpiredJun 20, 90Jul 27, 93[G06F]
5226132 Multiple virtual addressing using/comparing translation pairs of addresses comprising a space address and an origin address (STO) while using space registers as storage devices for a data processing systemExpiredSep 27, 89Jul 06, 93[G06F]

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