Inventor

SHAW DAVID N

US65 patents

⚠️ This page may combine multiple inventors who share the name “SHAW DAVID N”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

SHAW DAVID N

DUNHAM BUSH INC

Constant evaporator pressure slide valve modulator for screw compressor refrigeration system

Oil atomizing compressor working fluid cooling system for gas/vapor/helical screw rotary compressors

Compressor heat pump system with maximum and minimum evaporator ΔT control

Attic mounted solar assist multi-source/sink residential heat pump system

Tri-level multi-cylinder reciprocating compressor heat pump system

Refrigeration system on/off cycle

Heat pump system with high efficiency reversible helical screw rotary compressor

Undercompression and overcompression free helical screw rotary compressor

Helical screw rotary compressor for air conditioning system having improved oil management

Self-cleaning single loop mist type lubrication system for screw compressors

Combined pressure matching and capacity control slide valve assembly for helical screw rotary machine

Reciprocating compressor refrigeration system using step expansion and auto staging

Air source heat pump with displacement doubling through multiple slide rotary screw compressor/expander unit

Multi-step regenerated organic fluid helical screw expander hermetic induction generator system

Vertical axis hermetic rotary helical screw compressor with improved rotary bearings and oil management

Reverse fan heat pump defrost control system

Oil equalization system for parallel connected hermetic helical screw compressor units

Air source heat pump with multiple slide rotary screw compressor/expander

Stepping type unloading system for helical screw rotary compressor

Screw compressor slide valve engine RPM tracking system

Unloading control system for helical screw compressor refrigeration system

Control system for screw compressor

High speed variable delivery helical screw compressor/expander automotive air conditioning and waste heat energy _recovery system

(unassigned)

Boosted air source heat pump

Boosted air source heat pump

Variable speed parallel centrifugal compressors for HVAC and refrigeration systems

Series connected primary and booster compressors

Multi-rotor helical-screw compressor

Multi-rotor helical-screw compressor with discharge side thrust balance device

Variable capacity vapor compression cooling system

Multi-rotor helical screw compressor with unloading

Variable capacity vapor compression cooling system

Multi-rotor helical-screw compressor with thrust balance device

CARRIER CORP

Refrigeration temperature control system

Unloading system for two compressors

Evaporator feed system with flash cooled motor

Unloading system for two-stage compressors

Common compression zone access ports for positive displacement compressor

Capacity volume ratio control for twin screw compressors

Combined oil heater and level sensor

Oil separator

COPELAND CORP

Refrigeration system

Refrigeration system

Refrigeration system

Highly efficient flexible two-stage refrigeration system

SVENSKA ROTOR MASKINER AB

Refrigeration plant and rotary positive displacement machine

DURHAM BUSH INC

Control system for screw compressor

SHAW DAVID N

Bottoming cycle refrigerant scavenging for positive displacement compressor, refrigeration and heat pump systems

HALLOWELL INTERNATIONAL LLC

Oil balance system and method for compressors connected in series

SHAW ENGINEERING ASSOCIATES LL

Boosted air source heat pump