Schaefer; Donald D. Patent Filings

Patent	Date
Screw step drive internal volume ratio varying system for helical screw rotary compressor Grant 4,909,716 - Orosz , et al. March 20, 1	1990-03-20
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 Grant 4,545,742 - Schaefer October 8, 1	1985-10-08
Modular unload slide valve control assembly for a helical screw rotary compressor Grant 4,508,491 - Schaefer April 2, 1	1985-04-02
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 Grant 4,477,233 - Schaefer October 16, 1	1984-10-16
Oil equalization system for parallel connected compressors Grant 4,383,802 - Gianni , et al.	1983-05-17
High speed variable delivery helical screw compressor/expander automotive air conditioning and waste heat energy _recovery system Grant 4,220,197 - Schaefer , et al. September 2, 1	1980-09-02
Hermetic rotary helical screw compressor with improved oil management Grant 3,922,114 - Hamilton , et al. November 25, 1	1975-11-25
Optimized point of injection of liquid refrigerant in a helical screw rotary compressor for refrigeration use Grant 3,885,402 - Moody, Jr. , et al. May 27, 1	1975-05-27
Hydrodynamic Thrust Bearing Arrangement For Rotary Screw Compressor Grant 3,811,805 - Moody, Jr. , et al. May 21, 1	1974-05-21
Composite Variable Oil Pressure Relief And Compressor Unload Valve Assembly Grant 3,759,636 - Schaefer , et al. September 18, 1	1973-09-18

Patent

Date

Screw step drive internal volume ratio varying system for helical screw rotary compressor
Grant 4,909,716 - Orosz , et al. March 20, 1

1990-03-20

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
Grant 4,545,742 - Schaefer October 8, 1

1985-10-08

Modular unload slide valve control assembly for a helical screw rotary compressor
Grant 4,508,491 - Schaefer April 2, 1

1985-04-02

1984-10-16

Oil equalization system for parallel connected compressors
Grant 4,383,802 - Gianni , et al.

1983-05-17

High speed variable delivery helical screw compressor/expander automotive air conditioning and waste heat energy _recovery system
Grant 4,220,197 - Schaefer , et al. September 2, 1

1980-09-02

Hermetic rotary helical screw compressor with improved oil management
Grant 3,922,114 - Hamilton , et al. November 25, 1

1975-11-25

Optimized point of injection of liquid refrigerant in a helical screw rotary compressor for refrigeration use
Grant 3,885,402 - Moody, Jr. , et al. May 27, 1

1975-05-27

Hydrodynamic Thrust Bearing Arrangement For Rotary Screw Compressor
Grant 3,811,805 - Moody, Jr. , et al. May 21, 1

1974-05-21

Composite Variable Oil Pressure Relief And Compressor Unload Valve Assembly
Grant 3,759,636 - Schaefer , et al. September 18, 1

1973-09-18

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Schaefer; Donald D.

Patent Applications and Registrations