Inventor · disambiguated record
Douglas G. Ryan
Also filed as: RYAN DOUGLAS · RYAN DOUGLAS G
14 granted patents·1 pending application·243 citations·filing 1975–2001
92Inventor score
Top patents by PatentIndex Score
15 records- 0194US4512878AUsed oil re-refiningEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Apr 23, 1985·102 cites·11 claims
- 0285US3975396ADeasphalting processEXXON RESEARCH ENGINEERING CO·Filed 1975·Granted Aug 17, 1976·34 cites·8 claims
- 0374US4346008ARotary drum filterEXXON RESEARCH ENGINEERING CO·Filed 1980·Granted Aug 24, 1982·32 cites·14 claims
- 0458US4622118AMethod and apparatus for separating wax/water from hydrocarbon oil mixture boiling in the lubricating oil rangeEXXON RESEARCH ENGINEERING CO·Filed 1985·Granted Nov 11, 1986·19 cites·26 claims
- 0556US4627901ASeparating wax from hydrocarbon mixture boiling in the lubricating oil rangeEXXON RESEARCH ENGINEERING CO·Filed 1985·Granted Dec 9, 1986·15 cites·56 claims
- 0640US4820400AProcess for removing haze from dewaxed hydrocarbon oil mixture boiling in the lubricating oil range (OP-3379)EXXON RESEARCH ENGINEERING CO·Filed 1988·Granted Apr 11, 1989·10 cites·11 claims
- 0735US4309288ARotary drum filterEXXON RESEARCH ENGINEERING CO·Filed 1980·Granted Jan 5, 1982·9 cites·13 claims
- 0834US4216075ACombination dewaxing processRYAN DOUGLAS G·Filed 1978·Granted Aug 5, 1980·5 cites·17 claims
- 0933US4702817ARemoving haze from hydrocarbon oil mixture boiling in the lubricating oil rangeEXXON RESEARCH ENGINEERING CO·Filed 1985·Granted Oct 27, 1987·5 cites·24 claims
- 1030US4629546AMethod and apparatus for centrifugal separation of dispersed phase from a continuous liquid phaseEXXON RESEARCH ENGINEERING CO·Filed 1985·Granted Dec 16, 1986·2 cites·38 claims
- 1130US4314886AMechanically agitated liquid-vapor contacting apparatusEXXON RESEARCH ENGINEERING CO·Filed 1980·Granted Feb 9, 1982·3 cites·4 claims
- 1229US4490240ARemoval of corrodants from NMP solvent by contacting with sacrificial metalEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Dec 25, 1984·3 cites·4 claims
- 1329US4217203AContinuous autorefrigerative dewaxing process and apparatusEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted Aug 12, 1980·1 cites·14 claims
- 1429US2005116198A1Stabilisation of particulate material using wool greaseFiled 2001·Application pending·0 cites
- 1527US4904367ARemoving haze from dewaxed hydrocarbon oil mixture boiling in the lubricating oil rangeEXXON RESEARCH ENGINEERING CO·Filed 1987·Granted Feb 27, 1990·3 cites·18 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →