Nippon Densan Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H02K DYNAMO-ELECTRIC MACHINES 1394
 
  
 
G11B INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER 4134
 
  
 
B21K MAKING FORGED OR PRESSED PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS, WHEELS 122
 
  
 
F16C SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OF CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS 169
 
  
 
F16J PISTONS; CYLINDERS; PRESSURE VESSELS IN GENERAL; SEALINGS149
 
  
 
F28F DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION 151
 
  
 
H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS 176
 
  
 
H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, GENERATORS, OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS 186

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5610462 Brushless motorJun 20, 94Mar 11, 97[H02K]
5559382 Spindle motorSep 30, 93Sep 24, 96[F16C, H02H]
5484013 Heat sink fanMay 20, 94Jan 16, 96[F28F]
5453890 Low airflow hard disk apparatusMar 09, 94Sep 26, 95[G11B]
5436519 Fan motorJan 07, 94Jul 25, 95[H02K]
5426548 Disk clamping assembly for a low profile disk drive apparatusFeb 25, 93Jun 20, 95[G11B]
5396159 Method of starting a motorSep 09, 93Mar 07, 95[H02P]
5363003 Motor and circuitry for protecting sameJun 01, 92Nov 08, 94[H02K]
5363028 Circuit and method of driving a DC motorJun 01, 92Nov 08, 94[H02K]
5357160 IC controlled DC motorJan 22, 93Oct 18, 94[H02K]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5705866 Spindle motorExpiredJun 02, 95Jan 06, 98[H02K]
5689147 Brushless motorExpiredFeb 06, 95Nov 18, 97[H02K]
5661352 Connector-equipped spindle motorExpiredJan 31, 95Aug 26, 97[H02K]
5659213 Spindle motorExpiredNov 15, 94Aug 19, 97[G11B]
5604412 Brushless motor and a control circuit thereofExpiredMar 16, 94Feb 18, 97[H02P]
5596235 Spindle motor with seal structureExpiredFeb 17, 94Jan 21, 97[H02K]
5574342 Brushless motorExpiredApr 12, 95Nov 12, 96[H02K]
5554916 Method of starting a sensorless motorExpiredNov 30, 93Sep 10, 96[G05B]
5521349 Projection welding methodExpiredApr 06, 94May 28, 96[B23K]
5521472 Multiphase DC motor and starting method thereofExpiredDec 06, 93May 28, 96[H02K]
5475294 Charge controller for battery chargerExpiredDec 15, 92Dec 12, 95[H02J, H01M]
5459361 Spindle motorExpiredJul 09, 93Oct 17, 95[H02K]
5457588 Low profile hydrodynamic motor having minimum leakage propertiesExpiredSep 15, 93Oct 10, 95[H02K, G11B]
5452156 Spindle motor with combined pressure relief and adhesive carrying annular recessesExpiredFeb 24, 94Sep 19, 95[G11B]
5428284 Method of and circuit for starting sensorless motorExpiredJul 13, 94Jun 27, 95[H02P]
5412367 TransformerExpiredMar 24, 93May 02, 95[H01F]
5402023 Spindle motor and magnetic fluid seal apparatus used thereforExpiredAug 04, 93Mar 28, 95[H02K]
5396135 MotorExpiredMar 10, 94Mar 07, 95[H02K, F16C]
5381066 Spindle motor with a sealing memberExpiredFeb 25, 93Jan 10, 95[H02K]
5365458 Motor eccentricity measuring apparatusExpiredMar 25, 92Nov 15, 94[G01B]

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