Dunham-Bush
51Patents
0Active
51Granted
38Portfolio score
Filing activity: Jul 26, 1974 → Mar 7, 1994
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4545742A | Vertical 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 area | Mechanical Engineering; Lighting; Heating | 72 | Expired |
| US4583373A | Constant evaporator pressure slide valve modulator for screw compressor refrigeration system | Mechanical Engineering; Lighting; Heating | 65 | Expired |
| US4257795A | Compressor heat pump system with maximum and minimum evaporator .DELTA.T control | Mechanical Engineering; Lighting; Heating | 59 | Expired |
| US3936239A | Undercompression and overcompression free helical screw rotary compressor | Mechanical Engineering; Lighting; Heating | 54 | Expired |
| US4058988A | Heat pump system with high efficiency reversible helical screw rotary compressor | Mechanical Engineering; Lighting; Heating | 53 | Expired |
| US4497185A | Oil atomizing compressor working fluid cooling system for gas/vapor/helical screw rotary compressors | Mechanical Engineering; Lighting; Heating | 50 | Expired |
| US4383802A | Oil equalization system for parallel connected compressors | Mechanical Engineering; Lighting; Heating | 46 | Expired |
| US4478054A | Helical screw rotary compressor for air conditioning system having improved oil management | Emerging Cross-Sectional Technologies | 41 | Expired |
| US4180986A | Refrigeration system on/off cycle | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US4179248A | Oil equalization system for parallel connected hermetic helical screw compressor units | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4335582A | Unloading control system for helical screw compressor refrigeration system | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US4197719A | Tri-level multi-cylinder reciprocating compressor heat pump system | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US4249866A | Control system for screw compressor | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US4181474A | Vertical axis hermetic rotary helical screw compressor with improved rotary bearings and oil management | Emerging Cross-Sectional Technologies | 30 | Expired |
| US4220197A | High speed variable delivery helical screw compressor/expander automotive air conditioning and waste heat energy _recovery system | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4242872A | Attic mounted solar assist multi-source/sink residential heat pump system | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5423378A | Heat exchanger element and heat exchanger using same | Emerging Cross-Sectional Technologies | 26 | Expired |
| US4727907A | Turbulator with integral flow deflector tabs | Mechanical Engineering; Lighting; Heating | 26 | Expired |
| US4388048A | Stepping type unloading system for helical screw rotary compressor | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US4284133A | Concentric tube heat exchange assembly with improved internal fin structure | Mechanical Engineering; Lighting; Heating | 23 | Expired |
| US4508491A | Modular unload slide valve control assembly for a helical screw rotary compressor | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| USRE30499E | Injection cooling of screw compressors | General | 21 | Expired |
| US4030179A | Method of manufacturing low cost non-porous metal connecting rods | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4375156A | Closed loop compressed gas system with oil mist lubricated screw compressor | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US4209996A | Reciprocating compressor refrigeration system using step expansion and auto staging | Emerging Cross-Sectional Technologies | 19 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.