RICOH ELECTRONIC DEVICES CO., LTD.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G05F SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES 10725
 
  
 
H01L SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR 37325
 
  
 
H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY 2199
 
  
 
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 1389
 
  
 
H03K PULSE TECHNIQUE 13118
 
  
 
H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS 1067
 
  
 
H01M PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY 9145
 
  
 
H03F AMPLIFIERS 875
 
  
 
G01R MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES 7152
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 7440

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
9812959 Step up/down switching regulatorAug 20, 14Nov 07, 17[H02M]
9584019 Switching regulator and control method thereofSep 03, 13Feb 28, 17[H02M, G05F]
9431907 Switching regulator incorporating operation monitorAug 18, 14Aug 30, 16[H02M]
9413243 Non-insulating type switching power supply deviceSep 09, 13Aug 09, 16[H02M]
9276398 Protective semiconductor device for secondary cellMar 13, 13Mar 01, 16[H02J, H01M, G01R, H02H]
9223334 Constant current circuit and light emitting diode driving device using the sameJun 16, 11Dec 29, 15[H05B, G05F]
9146261 Electronic device and method of electronic device for determining power source deviceSep 05, 13Sep 29, 15[H02J, G06F, G01R]
9148133 Trimming circuit, power supply including trimming circuit, and trimming methodJul 23, 13Sep 29, 15[H03K, H02J, H02M, G05F]
9136847 Signal transmitting-receiving control circuit and secondary battery protection circuitMar 14, 11Sep 15, 15[H02J, H03K]
9103893 Voltage monitor semiconductor device, battery pack, and electronic device employing battery packMar 08, 12Aug 11, 15[H02J, G01R]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2014/0327,421 SWITCHING REGULATOR AND METHOD FOR CONTROLLING THE SWITCHING REGULATORAbandonedApr 30, 14Nov 06, 14[H02M]
2014/0070,779 SWITCHING REGULATORAbandonedSep 11, 13Mar 13, 14[H02M]
8670605 Identification method of data point distribution area on coordinate plane and recording mediumExpiredMar 10, 11Mar 11, 14[G06K]
8655049 Identification method of data point distribution area on coordinate plane and recording mediumExpiredMar 09, 11Feb 18, 14[G06K]
8649532 Electronic volume circuitExpiredAug 05, 10Feb 11, 14[H03F, H03G]
8624677 Semiconductor deviceExpiredMar 09, 12Jan 07, 14[H03F]
8599521 Switching regulator and operation control methodExpiredJun 16, 09Dec 03, 13[H02H]
8587346 Driving circuit and electronic device using the sameExpiredSep 18, 06Nov 19, 13[H03K, G09G, G05F]
8581657 Voltage divider, constant voltage circuit using same, and trimming method in the voltage divider circuitExpiredFeb 21, 07Nov 12, 13[G05F]
8575904 Semiconductor device and manufacturing method thereofExpiredDec 25, 08Nov 05, 13[G05F]
8564460 Keyboard device and method of identifying a key operationExpiredMar 11, 09Oct 22, 13[H04M, H03K, H03M, G09G, G06F]
8544752 Nonvolatile memory card adaptable to plural specificationsExpiredMar 14, 06Oct 01, 13[G06K]
8541998 Switching converter circuitExpiredAug 17, 11Sep 24, 13[G05F]
8542229 Identification method of data point distribution area on coordinate plane and recording mediumExpiredApr 05, 11Sep 24, 13[G06T, G01B, G06K]
2013/0241,471 CHARGE CONTROL CIRCUIT AND BATTERY DEVICEAbandonedMar 12, 13Sep 19, 13[H02J]
2013/0241,516 SWITCHING REGULATORAbandonedMar 11, 13Sep 19, 13[G05F]
8502417 Power source device and output voltage changing method of the power source deviceExpiredApr 07, 09Aug 06, 13[H02J]
8502508 Switching regulator circuit configured to perform step up and step down operations and operation method thereforExpiredOct 26, 10Aug 06, 13[G05F]
2013/0188,287 PROTECTION CIRCUIT, CHARGE CONTROL CIRCUIT, AND REVERSE CURRENT PREVENTION METHOD EMPLOYING CHARGE CONTROL CIRCUITAbandonedJan 24, 13Jul 25, 13[H02H]
8482267 Variable voltage DC-DC converterExpiredApr 06, 09Jul 09, 13[G05F]

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