HITACHI COMMUNICATION SYSTEMS, INC.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H03G CONTROL OF AMPLIFICATION 646
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 1446
 
  
 
H01L SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR 1361
 
  
 
H03F AMPLIFIERS 182
 
  
 
H03K PULSE TECHNIQUE 1130
 
  
 
H04M TELEPHONIC COMMUNICATION 1162
 
  
 
H04N PICTORIAL COMMUNICATION, e.g. TELEVISION 1241
 
  
 
H04Q SELECTING 1109

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
7215203 High frequency power amplifier circuit deviceMay 01, 06May 08, 07[H03G]
7078974 High frequency power amplifier circuitSep 16, 05Jul 18, 06[H03G]
7049892 High frequency power amplifier circuit deviceMay 21, 04May 23, 06[H03G]
6976138 Semiconductor device for data communication control and radio communication apparatusOct 30, 01Dec 13, 05[G06F]
6967535 High frequency power amplifier circuitMar 15, 05Nov 22, 05[H03G]
6759906 High frequency power amplifier circuit deviceJun 14, 02Jul 06, 04[H03G]
6756850 High frequency power amplifier circuitMay 17, 02Jun 29, 04[H03G]
6605999 High-frequency power amplifier, wireless communication apparatus and wireless communication systemOct 31, 01Aug 12, 03[H03F]
5495186 Differential type MOS transmission circuitJul 13, 94Feb 27, 96[H03K]
5373316 Video conference device with facsimile functionMar 05, 93Dec 13, 94[H04M, H04N]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6885246 High frequency amplifierExpiredFeb 21, 03Apr 26, 05[H03G]
6879592 Switching system and switching control methodExpiredFeb 29, 00Apr 12, 05[H04L]
2004/0164,808 High frequency power amplifier circuitAbandonedFeb 25, 04Aug 26, 04[H03F]
6671375 Telephone circuitExpiredJul 05, 00Dec 30, 03[H04M]
6434286 Optical signal switching apparatusExpiredJan 30, 01Aug 13, 02[G02B]
6229932 Optical signal switching apparatusExpiredOct 30, 98May 08, 01[G02B]
6021134 Cell/packet assembly and disassembly apparatus and network systemExpiredOct 14, 97Feb 01, 00[H04J]
5880601 Signal receiving circuit and digital signal processing systemExpiredFeb 27, 97Mar 09, 99[H03K]
5815564 System for connecting an incoming call to a selected one of a number of extensionsExpiredJul 19, 96Sep 29, 98[H04M]
5734653 Cell/ packet assembly and disassembly apparatus and network systemExpiredMay 30, 96Mar 31, 98[H04J]
5631931 Bus type clock supplying system for providing a clock in a communication system with a plurality of clock bus linesExpiredMar 29, 94May 20, 97[H04B]
5600630 Path changing system and method for use in ATM communication apparatusExpiredAug 25, 94Feb 04, 97[H04L, H04J]
5563940 System for connecting an incoming call to a selected one of a number of extensionsExpiredNov 15, 95Oct 08, 96[H04M]
5541992 System for connecting an incoming call to a selected one of a number of extensionsExpiredJun 11, 93Jul 30, 96[H04M]
5506783 Method and apparatusa for determining supply sequence of products ot be processed to production lineExpiredJun 29, 94Apr 09, 96[G06F]
5444740 A ternary signal transmission circuit and methodExpiredSep 03, 93Aug 22, 95[H04L, H04B]
5434717 Read and/or write integrated circuit having an operation timing adjusting circuit and constant current elementsExpiredMar 18, 94Jul 18, 95[G11B]
5237590 Timing extraction circuit and communication system utilizing the sameExpiredDec 11, 91Aug 17, 93[H04L]
5022057 Bit synchronization circuitExpiredMar 09, 89Jun 04, 91[H03L]
5010269 SAW resonator having a broad bandwidthExpiredDec 09, 88Apr 23, 91[H01L]

Top Inventors for This Owner

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