MARATHON ENGINE SYSTEMS, INC.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F25B REFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS 662
 
  
 
F02N STARTING OF COMBUSTION ENGINES 231
 
  
 
F01L CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES 154
 
  
 
F02B INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL 171
 
  
 
F02P IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES 138
 
  
 
F16C SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OF CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS 169
 
  
 
F25D REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHER SUBCLASS 145
 
  
 
F28F DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION 151
 
  
 
G05D SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES 183
 
  
 
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
6274941 Process and device for dosing the thermal output of combined heat and power generation systemsFeb 10, 98Aug 14, 01[F02N, H02P]
5996367 Heat pump and air conditioning system compressor unloading method and apparatusNov 01, 93Dec 07, 99[F25B]
5727396 Method and apparatus for cooling a prime mover for a gas-engine driven heat pumpDec 15, 95Mar 17, 98[F25B, G05D]
5713320 Internal combustion engine starting apparatus and processJan 11, 96Feb 03, 98[F02N]
5628199 Microprocessor-based controllerJun 17, 94May 13, 97[F25B]
5515689 Defrosting heat pumpsMar 30, 94May 14, 96[F25D]
5501088 Exhaust gas discharge system for a gas engine heat pumpFeb 14, 94Mar 26, 96[F28F]
5473910 Apparatus and method for exhaust gas dispersion and condensate removal for gas engine driven heat pumpsSep 20, 93Dec 12, 95[F25B]
5385408 Rocker tip roller hydrodynamic bearing oil slotsOct 18, 93Jan 31, 95[F01L, F16C]
5319944 Engine drive air conditionerJul 16, 93Jun 14, 94[F25B]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5822997 Thermostat setback recovery method and apparatusExpiredDec 04, 96Oct 20, 98[F23N, F25D]
5755283 Combined thermostat and selector valve arrangement for gas driven heat pump systemsExpiredDec 06, 96May 26, 98[F01P]
5724945 Carburetor air/fuel ratio control for single cylinder enginesExpiredSep 18, 96Mar 10, 98[F02M]
5438844 Microprocessor-based controllerExpiredSep 01, 92Aug 08, 95[G05B]
5435485 Automatic purge system for gas engine heat pumpExpiredJul 26, 93Jul 25, 95[F25B, G05D]
5429179 Gas engine driven heat pump system having integrated heat recovery and auxiliary componentsExpiredAug 23, 93Jul 04, 95[F25B]
5375570 Engine compression releaseExpiredAug 31, 93Dec 27, 94[F02N]
5370307 Air conditioner having high heating capacityExpiredSep 23, 92Dec 06, 94[G05D]
5363673 Simplified engine coolant system for gas engine heat pumpExpiredJul 12, 93Nov 15, 94[F25B]
5345918 Fuel system and constant gas pressure governor for a single-cylinder, four-stroke cycle engineExpiredMar 19, 93Sep 13, 94[F02M]
5314009 Exhaust gas recuperatorExpiredOct 08, 92May 24, 94[F16D, F16F]
5311849 Carburetor assembly for an internal combustion gas engineExpiredJul 14, 92May 17, 94[F02M, F02D]
5275142 Air-fuel ratio optimization logic for an electronic engine control systemsExpiredJun 16, 92Jan 04, 94[F02D]
5249742 Coolant circulation system for engine heat pumpExpiredJul 24, 92Oct 05, 93[G05D]
5029449 Heat pump booster compressor arrangementExpiredFeb 23, 90Jul 09, 91[F25B]
5020320 Engine driven heat pump systemExpiredDec 20, 89Jun 04, 91[F25B]
4991400 Engine driven heat pump with auxiliary generatorExpiredFeb 23, 90Feb 12, 91[F25B]
4901918 Adaptive anticipator mechanism for limiting room temperature swingsExpiredFeb 27, 89Feb 20, 90[G05D]
4891955 Engine suspension systemExpiredMar 14, 89Jan 09, 90[F25D]
4889280 Temperature and humidity auctioneering controlExpiredFeb 24, 89Dec 26, 89[B01F]

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