HITACHI AIR CONDITIONING SYSTEMS CO.,LTD.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F04C ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS 245
 
  
 
F25B REFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS 266
 
  
 
B01D SEPARATION 1133
 
  
 
F25D REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHER SUBCLASS 145
 
  
 
F28D HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT 144

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6832488 Refrigerating machineJul 08, 03Dec 21, 04[F25B]
6640579 Laminated heat exchanger and refrigeration cycleAug 13, 02Nov 04, 03[F28D, F25D]
6554595 Compressor with oil-mist separatorMay 02, 01Apr 29, 03[F04C, B01D]
6506039 Screw compressorNov 30, 01Jan 14, 03[F04C]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7064514 Motor drive system for AC motorsExpiredFeb 20, 04Jun 20, 06[H02P]
7007505 Refrigerating deviceExpiredMay 26, 04Mar 07, 06[F25B]
2005/0204,760 Refrigerating apparatus and inverter deviceAbandonedDec 02, 04Sep 22, 05[F25B]
6874692 Monitoring center and service system of air conditionerExpiredJan 29, 04Apr 05, 05[G05D]
6738014 Monitoring center and service system of air conditionerExpiredNov 30, 01May 18, 04[H04B, G01S]
6705104 Fresh water generating apparatusExpiredNov 16, 01Mar 16, 04[F25D]
6634875 Scroll compressor having an Oldham's ring containing silicon particlesExpiredMar 19, 02Oct 21, 03[F04C, F16D]
2003/0033,165 Environmental service system and environmental service businessAbandonedAug 06, 02Feb 13, 03[G06F]
6516629 Refrigeration cycleExpiredJun 28, 02Feb 11, 03[F25B]
6422844 Screw compressorExpiredDec 28, 00Jul 23, 02[F03C]
6343482 Heat pump type conditioner and exterior unitExpiredOct 31, 00Feb 05, 02[F25B]

Top Inventors for This Owner

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