Inventor · disambiguated record
David N. Shaw
Also filed as: FIRST DAVID J · SCHAEFER DONALD D · SHAW DAVID · SHAW DAVID N
67 granted patents·5 pending applications·3,243 citations·filing 1974–2023
99Inventor score
Top patents by PatentIndex Score
72 records- 0199US4947655ARefrigeration systemCOPELAND CORP·Filed 1988·Granted Aug 14, 1990·188 cites·4 claims
- 0299US4787211ARefrigeration systemCOPELAND CORP·Filed 1986·Granted Nov 29, 1988·182 cites·42 claims
- 0398US6276148B1Boosted air source heat pumpFiled 2000·Granted Aug 21, 2001·116 cites·36 claims
- 0497US4058988AHeat pump system with high efficiency reversible helical screw rotary compressorDUNHAM BUSH INC·Filed 1976·Granted Nov 22, 1977·65 cites·25 claims
- 0597US3936239AUndercompression and overcompression free helical screw rotary compressorDUNHAM BUSH INC·Filed 1974·Granted Feb 3, 1976·85 cites·11 claims
- 0696US5927088ABoosted air source heat pumpFiled 1998·Granted Jul 27, 1999·130 cites·135 claims
- 0796US4594858AHighly efficient flexible two-stage refrigeration systemCOPELAND CORP·Filed 1984·Granted Jun 17, 1986·97 cites·16 claims
- 0896US4497185AOil 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
- 0995US4583373AConstant evaporator pressure slide valve modulator for screw compressor refrigeration systemDUNHAM BUSH INC·Filed 1984·Granted Apr 22, 1986·88 cites·9 claims
- 1095US4257795ACompressor heat pump system with maximum and minimum evaporator ΔT controlDUNHAM BUSH INC·Filed 1978·Granted Mar 24, 1981·74 cites·10 claims
- 1195US4179248AOil equalization system for parallel connected hermetic helical screw compressor unitsDUNHAM BUSH INC·Filed 1978·Granted Dec 18, 1979·52 cites·4 claims
- 1294US4249866AControl system for screw compressorDUNHAM BUSH INC·Filed 1978·Granted Feb 10, 1981·53 cites·27 claims
- 1394US4242872AAttic mounted solar assist multi-source/sink residential heat pump systemDUNHAM BUSH INC·Filed 1978·Granted Jan 6, 1981·70 cites·10 claims
- 1494US4222716ACombined 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
- 1593US4220197AHigh 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
- 1693US4180986ARefrigeration system on/off cycleDUNHAM BUSH INC·Filed 1978·Granted Jan 1, 1980·65 cites·6 claims
- 1792US4439121ASelf-cleaning single loop mist type lubrication system for screw compressorsDUNHAM BUSH INC·Filed 1982·Granted Mar 27, 1984·54 cites·5 claims
- 1892US4412788AControl system for screw compressorDURHAM BUSH INC·Filed 1981·Granted Nov 1, 1983·79 cites·22 claims
- 1992US4197719ATri-level multi-cylinder reciprocating compressor heat pump systemDUNHAM BUSH INC·Filed 1978·Granted Apr 15, 1980·65 cites·29 claims
- 2092US4181474AVertical 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
- 2191US7651322B2Oil balance system and method for compressors connected in seriesHALLOWELL INTERNATIONAL LLC·Filed 2007·Granted Jan 26, 2010·16 cites·19 claims
- 2291US4748820ARefrigeration systemCOPELAND CORP·Filed 1987·Granted Jun 7, 1988·77 cites·58 claims
- 2390US5062274AUnloading system for two compressorsCARRIER CORP·Filed 1990·Granted Nov 5, 1991·72 cites·9 claims
- 2490US4478054AHelical screw rotary compressor for air conditioning system having improved oil managementDUNHAM BUSH INC·Filed 1983·Granted Oct 23, 1984·83 cites·8 claims
- 2589US5845509AVariable speed parallel centrifugal compressors for HVAC and refrigeration systemsFiled 1997·Granted Dec 8, 1998·76 cites·12 claims
- 2689US5839886ASeries connected primary and booster compressorsFiled 1996·Granted Nov 24, 1998·66 cites·29 claims
- 2789US5065591ARefrigeration temperature control systemCARRIER CORP·Filed 1991·Granted Nov 19, 1991·73 cites·3 claims
- 2888US4335582AUnloading control system for helical screw compressor refrigeration systemDUNHAM BUSH INC·Filed 1981·Granted Jun 22, 1982·58 cites·3 claims
- 2987US6217304B1Multi-rotor helical-screw compressorFiled 1999·Granted Apr 17, 2001·43 cites·34 claims
- 3087US4899555AEvaporator feed system with flash cooled motorCARRIER CORP·Filed 1989·Granted Feb 13, 1990·64 cites·4 claims
- 3187US4178767AReverse fan heat pump defrost control systemDUNHAM BUSH INC·Filed 1978·Granted Dec 18, 1979·51 cites·7 claims
- 3286US10815669B2Multifunction structural furring systemHARDIE JAMES TECHNOLOGY LTD·Filed 2018·Granted Oct 27, 2020·14 cites·20 claims
- 3385US4388048AStepping type unloading system for helical screw rotary compressorDUNHAM BUSH INC·Filed 1981·Granted Jun 14, 1983·40 cites·4 claims
- 3485US4086072AAir source heat pump with multiple slide rotary screw compressor/expanderDUNHAM BUSH INC·Filed 1977·Granted Apr 25, 1978·40 cites·27 claims
- 3583US4878818ACommon compression zone access ports for positive displacement compressorCARRIER CORP·Filed 1988·Granted Nov 7, 1989·30 cites·16 claims
- 3682US8075283B2Oil balance system and method for compressors connected in seriesSHAW DAVID N·Filed 2008·Granted Dec 13, 2011·5 cites·16 claims
- 3781US6186758B1Multi-rotor helical-screw compressor with discharge side thrust balance deviceFiled 1998·Granted Feb 13, 2001·33 cites·26 claims
- 3880US7712329B2Oil balance system and method for compressorsSHAW DAVID·Filed 2005·Granted May 11, 2010·6 cites·13 claims
- 3980US4342199AScrew compressor slide valve engine RPM tracking systemDUNHAM BUSH INC·Filed 1980·Granted Aug 3, 1982·31 cites·10 claims
- 4080US4332144ABottoming cycle refrigerant scavenging for positive displacement compressor, refrigeration and heat pump systemsSHAW DAVID N·Filed 1981·Granted Jun 1, 1982·44 cites·11 claims
- 4180US4209996AReciprocating compressor refrigeration system using step expansion and auto stagingDUNHAM BUSH INC·Filed 1978·Granted Jul 1, 1980·31 cites·18 claims
- 4279US4185465AMulti-step regenerated organic fluid helical screw expander hermetic induction generator systemDUNHAM BUSH INC·Filed 1978·Granted Jan 29, 1980·36 cites·7 claims
- 4378US6105378AVariable capacity vapor compression cooling systemFiled 1998·Granted Aug 22, 2000·41 cites·31 claims
- 4477US7980836B2Modular multi-rotor compressor and method of manufactureSHAW DAVID N·Filed 2008·Granted Jul 19, 2011·5 cites·10 claims
- 4576US4209998AAir 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
- 4675US6931871B2Boosted air source heat pumpSHAW ENGINEERING ASSOCIATES LL·Filed 2003·Granted Aug 23, 2005·27 cites·31 claims
- 4775US5170640AOil separatorCARRIER CORP·Filed 1991·Granted Dec 15, 1992·45 cites·11 claims
- 4875US5044894ACapacity volume ratio control for twin screw compressorsCARRIER CORP·Filed 1990·Granted Sep 3, 1991·31 cites·5 claims
- 4974US4375156AClosed loop compressed gas system with oil mist lubricated screw compressorDUNHAM BUSH INC·Filed 1980·Granted Mar 1, 1983·26 cites·4 claims
- 5072US4196595AIntegrated thermal solar heat pump systemDUNHAM BUSH INC·Filed 1978·Granted Apr 8, 1980·29 cites·19 claims
Showing the top 50 of 72 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →