UNITRODE CORPORATION

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H03K PULSE TECHNIQUE 12119
 
  
 
G05F SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES 1090
 
  
 
H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY 5115
 
  
 
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 597
 
  
 
H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS 473
 
  
 
H01L SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR 3359
 
  
 
H03M CODING, DECODING OR CODE CONVERSION, IN GENERAL 3108
 
  
 
H01R ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS 2131
 
  
 
H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATORS, OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS 285
 
  
 
G01N INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES 1205

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6448841 Efficiency charge pump circuitApr 30, 99Sep 10, 02[G05F]
6344959 Method for sensing the output voltage of a charge pump circuit without applying a load to the output stageApr 30, 99Feb 05, 02[H02H]
6317069 Digital-to-analog converter employing binary-weighted transistor arrayNov 24, 99Nov 13, 01[H03M]
6246184 Flashlight boost regulatorAug 03, 99Jun 12, 01[G05F]
6150714 Current sense element incorporated into integrated circuit package lead frameSep 18, 98Nov 21, 00[H01L]
6144245 Adaptive leading edge blanking circuit to eliminate spike on power switching transistor current sense signalJun 29, 98Nov 07, 00[H03K]
6114835 Multi-cell battery pack charge balancing circuitJul 26, 99Sep 05, 00[H02J]
6115469 Telephone line ring signal and DC power generatorAug 25, 98Sep 05, 00[H04M, H02M]
6034496 Motor speed control using fixed-duration torque burstsAug 13, 98Mar 07, 00[H01R]
5982130 Calibration technique to remove series resistance errors in the sensed back EMF of a motorAug 13, 98Nov 09, 99[H02P]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5130577 Computational circuit for transforming an analog input voltage into attenuated output current proportional to a selected transfer functionExpiredApr 09, 90Jul 14, 92[H03K, G06G]
5124576 Track and hold amplifierExpiredMar 26, 91Jun 23, 92[H03K]
5098861 Method of processing a semiconductor substrate including silicide bondingExpiredJan 08, 91Mar 24, 92[H01L]
5089767 Current sensor and limiterExpiredApr 09, 90Feb 18, 92[G05F]
5066869 Reset circuit with PNP saturation detectorExpiredApr 09, 90Nov 19, 91[H03K]
5032692 Process for manufactoring hermetic high temperature filter packages and the products produced therebyExpiredMay 09, 89Jul 16, 91[H05K]
4924288 High current-gain PNP transistorExpiredFeb 15, 89May 08, 90[H01L]
4914357 Temperature compensated foldback current limitingExpiredMar 23, 88Apr 03, 90[H03K]
4899064 Absolute value differential amplifierExpiredJun 01, 88Feb 06, 90[H03K]
4882533 Linear integrated circuit voltage drop generator having a base-10-emitter voltage independent current source thereinExpiredFeb 15, 89Nov 21, 89[G05F]
4849656 Power-on detection circuitExpiredJun 11, 87Jul 18, 89[H03K]
4795961 Low-noise voltage referenceExpiredJun 10, 87Jan 03, 89[G05F]
4743779 Adjustable threshold window circuitExpiredMar 20, 87May 10, 88[H03K, G01R]
4727264 Fast, low-power, low-drop driver circuitExpiredJun 27, 85Feb 23, 88[H03K]
4613767 Low forward-voltage drop SCRExpiredOct 31, 83Sep 23, 86[H03K]
4590391 Multi-input zero offset comparatorExpiredDec 19, 83May 20, 86[H03K, G01R]
4464573 Charged particle beam focussing deviceExpiredMar 08, 82Aug 07, 84[H01J, B23K, H05H]

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