Inventor · disambiguated record
Darrell W. Brownawell
Also filed as: BROWNAWELL DARRELL W · HOWLETT BARRY J
35 granted patents·3 pending applications·1,516 citations·filing 1976–2014
98Inventor score
Files withEXXON RESEARCH ENGINEERING CO29LUTEK LLC4EXXON CHEMICAL PATENTS INC2LOCKLEDGE SCOTT P2LUTECK LLC1
Top patents by PatentIndex Score
38 records- 0199US5225081AMethod for removing polynuclear aromatics from used lubricating oilsEXXON RESEARCH ENGINEERING CO·Filed 1991·Granted Jul 6, 1993·163 cites·16 claims
- 0298US5069799AMethod for rejuvenating lubricating oilsEXXON RESEARCH ENGINEERING CO·Filed 1989·Granted Dec 3, 1991·173 cites·4 claims
- 0397US4517104AEthylene copolymer viscosity index improver-dispersant additive useful in oil compositionsEXXON RESEARCH ENGINEERING CO·Filed 1981·Granted May 14, 1985·166 cites·33 claims
- 0496US5478463AMethod of reducing sludge and varnish precursors in lubricating oilsEXXON CHEMICAL PATENTS INC·Filed 1994·Granted Dec 26, 1995·83 cites·9 claims
- 0595US4632769AEthylene copolymer viscosity index improver-dispersant additive useful in oil compositionsEXXON RESEARCH ENGINEERING CO·Filed 1984·Granted Dec 30, 1986·104 cites·19 claims
- 0693US7520371B2Materials and processes for reducing combustion by-products in a lubrication system for an internal combustion engineLUTEK LLC·Filed 2005·Granted Apr 21, 2009·20 cites·31 claims
- 0793US5042617AMethod of reducing the presence of sludge in lubricating oilsEXXON RESEARCH ENGINEERING CO·Filed 1989·Granted Aug 27, 1991·71 cites·24 claims
- 0892US4973764AAlkylphenols and derivatives thereof via phenol alkylation by cracked petroleum distillatesEXXON RESEARCH ENGINEERING CO·Filed 1989·Granted Nov 27, 1990·33 cites·5 claims
- 0991US4906389AMethod for reducing piston depositsEXXON RESEARCH ENGINEERING CO·Filed 1988·Granted Mar 6, 1990·62 cites·52 claims
- 1091US4686054ASuccinimide lubricating oil dispersantEXXON RESEARCH ENGINEERING CO·Filed 1986·Granted Aug 11, 1987·63 cites·12 claims
- 1190US4502970ALubricating oil compositionEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Mar 5, 1985·49 cites·9 claims
- 1290US4113639ALubricating oil composition containing a dispersing-varnish inhibiting combination of an oxazoline compound and an acyl nitrogen compoundEXXON RESEARCH ENGINEERING CO·Filed 1976·Granted Sep 12, 1978·117 cites·6 claims
- 1388US4557847AEthylene copolymer viscosity index improver-dispersant additive useful in oil compositionsEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Dec 10, 1985·41 cites·21 claims
- 1486US8016125B2Materials, filters, and systems for immobilizing combustion by-products and controlling lubricant viscosityLUTEK LLC·Filed 2005·Granted Sep 13, 2011·11 cites·39 claims
- 1586US4173540ALubricating oil composition containing a dispersing-varnish inhibiting combination of polyol ester compound and a borated acyl nitrogen compoundEXXON RESEARCH ENGINEERING CO·Filed 1977·Granted Nov 6, 1979·38 cites·6 claims
- 1683US4558170APolyisobutylene processEXXON RESEARCH ENGINEERING CO·Filed 1984·Granted Dec 10, 1985·31 cites·8 claims
- 1782US5112482AFilter for removing hydroperoxides from lubricating oilsEXXON RESEARCH ENGINEERING CO·Filed 1990·Granted May 12, 1992·32 cites·6 claims
- 1882US4382002ADrilling fluids containing an additive compositionEXXON RESEARCH ENGINEERING CO·Filed 1981·Granted May 3, 1983·16 cites·5 claims
- 1981US5068044AMethod for reducing piston depositsEXXON RESEARCH ENGINEERING CO·Filed 1990·Granted Nov 26, 1991·26 cites·35 claims
- 2081US4977871ARemoval of carcinogenic hydrocarbons from used lubricating oil using activated carbonEXXON CHEMICAL PATENTS INC·Filed 1988·Granted Dec 18, 1990·40 cites·27 claims
- 2179US4486326ACopper complexes of oxazolines and lactone oxazolines as lubricating oil additivesEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Dec 4, 1984·21 cites·7 claims
- 2275US4914246AAlkylphenols and derivatives thereof via phenol alkylation by cracked petroleum distillatesEXXON RESEARCH ENGINEERING CO·Filed 1987·Granted Apr 3, 1990·21 cites·20 claims
- 2373US8691096B2Oil filters containing strong base and methods of their useLUTECK LLC·Filed 2012·Granted Apr 8, 2014·1 cites·6 claims
- 2473US5164101AMethod for reducing piston depositsEXXON RESEARCH ENGINEERING CO·Filed 1991·Granted Nov 17, 1992·25 cites·44 claims
- 2568US4427564AAdditive composition for release of stuck drill pipeEXXON RESEARCH ENGINEERING CO·Filed 1982·Granted Jan 24, 1984·23 cites·8 claims
- 2666US8607991B2Materials and processes for reducing combustion by-products in a lubrication system for an internal combustion engineLOCKLEDGE SCOTT P·Filed 2009·Granted Dec 17, 2013·4 cites·11 claims
- 2765US4569750AMethod for inhibiting deposit formation in structures confining hydrocarbon fluidsEXXON RESEARCH ENGINEERING CO·Filed 1984·Granted Feb 11, 1986·16 cites·11 claims
- 2858US4684473ALubricant oil composition with improved friction reducing propertiesEXXON RESEARCH ENGINEERING CO·Filed 1986·Granted Aug 4, 1987·14 cites·12 claims
- 2958US2014163296A1Oil filters containing strong base and methods of their useLUTEK LLC·Filed 2014·Application pending·0 cites
- 3057US4997546AMethod of removing hydroperoxides from lubricating oilsEXXON RESEARCH ENGINEERING CO·Filed 1989·Granted Mar 5, 1991·13 cites·37 claims
- 3156US4388201ACo-dispersant stabilized friction modifier lubricating oil compositionEXXON RESEARCH ENGINEERING CO·Filed 1981·Granted Jun 14, 1983·11 cites·9 claims
- 3255US2009194484A1Oil Filters Containing Strong Base and Methods of Their UseLUTEK LLC·Filed 2008·Application pending·0 cites
- 3351US2012175309A1Oil filters containing strong base and methods of their useLOCKLEDGE SCOTT P·Filed 2012·Application pending·0 cites
- 3448US5209839AMethod of removing hydroperoxides from lubricating oils using sodium hydroxide and a metal thiophosphateEXXON RESEARCH ENGINEERING CO·Filed 1992·Granted May 11, 1993·9 cites·14 claims
- 3547US4491524ALubricating additive for drilling mudsEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Jan 1, 1985·9 cites·9 claims
- 3642US5156758APolymeric amides for multifunctional VI improversEXXON RESEARCH ENGINEERING CO·Filed 1990·Granted Oct 20, 1992·7 cites·14 claims
- 3733US4431551AOxazolines of 2-(alkylthio)succinic acids as an additive for drilling mudsEXXON RESEARCH ENGINEERING CO·Filed 1982·Granted Feb 14, 1984·3 cites·8 claims
- 3830US4584386AAlkylthiomethyl substituted mono-oxazolinesEXXON RESEARCH ENGINEERING CO·Filed 1984·Granted Apr 22, 1986·0 cites·5 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →