Assignee
DUNHAM BUSH INC
47 granted patents·2,013 citations·filing 1974–1994
Top patents by PatentIndex Score
47 records- 0197US4058988AHeat pump system with high efficiency reversible helical screw rotary compressorDUNHAM BUSH INC·Filed 1976·Granted Nov 22, 1977·65 cites·25 claims
- 0297US3936239AUndercompression and overcompression free helical screw rotary compressorDUNHAM BUSH INC·Filed 1974·Granted Feb 3, 1976·85 cites·11 claims
- 0396US4497185AOil atomizing compressor working fluid cooling system for gas/vapor/helical screw rotary compressorsDUNHAM BUSH INC·Filed 1983·Granted Feb 5, 1985·83 cites·6 claims
- 0495US4583373AConstant evaporator pressure slide valve modulator for screw compressor refrigeration systemDUNHAM BUSH INC·Filed 1984·Granted Apr 22, 1986·88 cites·9 claims
- 0595US4545742AVertical axis hermetic helical screw rotary compressor with discharge gas oil mist eliminator and dual transfer tube manifold for supplying liquid refrigerant and refrigerant vapor to the compression areaDUNHAM BUSH INC·Filed 1984·Granted Oct 8, 1985·105 cites·2 claims
- 0695US4257795ACompressor heat pump system with maximum and minimum evaporator ΔT controlDUNHAM BUSH INC·Filed 1978·Granted Mar 24, 1981·74 cites·10 claims
- 0795US4179248AOil equalization system for parallel connected hermetic helical screw compressor unitsDUNHAM BUSH INC·Filed 1978·Granted Dec 18, 1979·52 cites·4 claims
- 0894US4249866AControl system for screw compressorDUNHAM BUSH INC·Filed 1978·Granted Feb 10, 1981·53 cites·27 claims
- 0994US4242872AAttic mounted solar assist multi-source/sink residential heat pump systemDUNHAM BUSH INC·Filed 1978·Granted Jan 6, 1981·70 cites·10 claims
- 1094US4222716ACombined pressure matching and capacity control slide valve assembly for helical screw rotary machineDUNHAM BUSH INC·Filed 1979·Granted Sep 16, 1980·34 cites·4 claims
- 1193US4220197AHigh speed variable delivery helical screw compressor/expander automotive air conditioning and waste heat energy _recovery systemDUNHAM BUSH INC·Filed 1979·Granted Sep 2, 1980·50 cites·23 claims
- 1293US4180986ARefrigeration system on/off cycleDUNHAM BUSH INC·Filed 1978·Granted Jan 1, 1980·65 cites·6 claims
- 1392US4439121ASelf-cleaning single loop mist type lubrication system for screw compressorsDUNHAM BUSH INC·Filed 1982·Granted Mar 27, 1984·54 cites·5 claims
- 1492US4197719ATri-level multi-cylinder reciprocating compressor heat pump systemDUNHAM BUSH INC·Filed 1978·Granted Apr 15, 1980·65 cites·29 claims
- 1592US4181474AVertical axis hermetic rotary helical screw compressor with improved rotary bearings and oil managementDUNHAM BUSH INC·Filed 1978·Granted Jan 1, 1980·51 cites·21 claims
- 1690US4478054AHelical screw rotary compressor for air conditioning system having improved oil managementDUNHAM BUSH INC·Filed 1983·Granted Oct 23, 1984·83 cites·8 claims
- 1790US4383802AOil equalization system for parallel connected compressorsDUNHAM BUSH INC·Filed 1981·Granted May 17, 1983·67 cites·6 claims
- 1888US4335582AUnloading control system for helical screw compressor refrigeration systemDUNHAM BUSH INC·Filed 1981·Granted Jun 22, 1982·58 cites·3 claims
- 1987US4178767AReverse fan heat pump defrost control systemDUNHAM BUSH INC·Filed 1978·Granted Dec 18, 1979·51 cites·7 claims
- 2085US4388048AStepping type unloading system for helical screw rotary compressorDUNHAM BUSH INC·Filed 1981·Granted Jun 14, 1983·40 cites·4 claims
- 2185US4086072AAir source heat pump with multiple slide rotary screw compressor/expanderDUNHAM BUSH INC·Filed 1977·Granted Apr 25, 1978·40 cites·27 claims
- 2283US4284133AConcentric tube heat exchange assembly with improved internal fin structureDUNHAM BUSH INC·Filed 1979·Granted Aug 18, 1981·52 cites·4 claims
- 2382US4030179AMethod of manufacturing low cost non-porous metal connecting rodsDUNHAM BUSH INC·Filed 1976·Granted Jun 21, 1977·38 cites·3 claims
- 2480US4477233AVertical axis hermetic helical screw rotary compressor with discharge gas oil mist eliminator and dual transfer tube manifold for supplying liquid refrigerant and refrigerant vapor to the compression areaDUNHAM BUSH INC·Filed 1982·Granted Oct 16, 1984·32 cites·6 claims
- 2580US4342199AScrew compressor slide valve engine RPM tracking systemDUNHAM BUSH INC·Filed 1980·Granted Aug 3, 1982·31 cites·10 claims
- 2680US4209996AReciprocating compressor refrigeration system using step expansion and auto stagingDUNHAM BUSH INC·Filed 1978·Granted Jul 1, 1980·31 cites·18 claims
- 2779US4508491AModular unload slide valve control assembly for a helical screw rotary compressorDUNHAM BUSH INC·Filed 1982·Granted Apr 2, 1985·31 cites·6 claims
- 2879US4185465AMulti-step regenerated organic fluid helical screw expander hermetic induction generator systemDUNHAM BUSH INC·Filed 1978·Granted Jan 29, 1980·36 cites·7 claims
- 2977US5423378AHeat exchanger element and heat exchanger using sameDUNHAM BUSH INC·Filed 1994·Granted Jun 13, 1995·61 cites·10 claims
- 3077US4727907ATurbulator with integral flow deflector tabsDUNHAM BUSH INC·Filed 1987·Granted Mar 1, 1988·43 cites·7 claims
- 3176US4209998AAir source heat pump with displacement doubling through multiple slide rotary screw compressor/expander unitDUNHAM BUSH INC·Filed 1978·Granted Jul 1, 1980·32 cites·2 claims
- 3274US4536130ASimplified unloader indicator for helical screw rotary compressorDUNHAM BUSH INC·Filed 1984·Granted Aug 20, 1985·27 cites·5 claims
- 3374US4375156AClosed loop compressed gas system with oil mist lubricated screw compressorDUNHAM BUSH INC·Filed 1980·Granted Mar 1, 1983·26 cites·4 claims
- 3472US4196595AIntegrated thermal solar heat pump systemDUNHAM BUSH INC·Filed 1978·Granted Apr 8, 1980·29 cites·19 claims
- 3569US4076461AFeedback control system for helical screw rotary compressorsDUNHAM BUSH INC·Filed 1974·Granted Feb 28, 1978·26 cites·18 claims
- 3668US4495778ATemperature and pressure actuated capacity control system for air conditioning systemDUNHAM BUSH INC·Filed 1984·Granted Jan 29, 1985·22 cites·12 claims
- 3767US4909716AScrew step drive internal volume ratio varying system for helical screw rotary compressorDUNHAM BUSH INC·Filed 1988·Granted Mar 20, 1990·25 cites·10 claims
- 3867US4527967AScrew rotor machine with specific tooth profileDUNHAM BUSH INC·Filed 1984·Granted Jul 9, 1985·22 cites·9 claims
- 3966US4245476ASolar augmented heat pump system with automatic staging reciprocating compressorDUNHAM BUSH INC·Filed 1979·Granted Jan 20, 1981·24 cites·17 claims
- 4065US4199102ATemperature control systemDUNHAM BUSH INC·Filed 1978·Granted Apr 22, 1980·19 cites·13 claims
- 4160US4148436ASolar augmented heat pump system with automatic staging reciprocating compressorDUNHAM BUSH INC·Filed 1977·Granted Apr 10, 1979·20 cites·3 claims
- 4260US4045977ASelf operating excess refrigerant storage system for a heat pumpDUNHAM BUSH INC·Filed 1976·Granted Sep 6, 1977·22 cites·2 claims
- 4336US4585169AConstant volume flow burner fuel control systemDUNHAM BUSH INC·Filed 1982·Granted Apr 29, 1986·11 cites·2 claims
- 4432US4647801AElectric motor back-stopping deviceDUNHAM BUSH INC·Filed 1985·Granted Mar 3, 1987·10 cites·8 claims
- 4529US4014362ASimplified balance valve steam trapDUNHAM BUSH INC·Filed 1975·Granted Mar 29, 1977·6 cites·2 claims
- 4627US4079887ATemperature control systemDUNHAM BUSH INC·Filed 1976·Granted Mar 21, 1978·2 cites·10 claims
- 4717US4437816AVariable volume positive displacement rotary pumpDUNHAM BUSH INC·Filed 1980·Granted Mar 20, 1984·2 cites·4 claims
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