Inventor · disambiguated record
John M. Longo
Also filed as: LEWANDOWSKI JOSEPH T · LONGO JOHN · LONGO JOHN M · SAVAGE DAVID W
39 granted patents·790 citations·filing 1974–2018
98Inventor score
Files withEXXON RESEARCH ENGINEERING CO25BAKER HUGHES INC3EXXON PRODUCTION RESEARCH CO3BAKER HUGHES A GE CO LLC2JACOBI DAVID J2
Top patents by PatentIndex Score
39 records- 0192US10725201B2Compensated neutron correction for contributions outside the petrophysical modelBAKER HUGHES A GE CO LLC·Filed 2018·Granted Jul 28, 2020·6 cites·16 claims
- 0292US4163706ABi2 [M2-x Bix ]O7-y compounds wherein M is Ru, Ir or mixtures thereof, and electrochemical devices containing same (Bat-24)EXXON RESEARCH ENGINEERING CO·Filed 1977·Granted Aug 7, 1979·42 cites·34 claims
- 0392US4001375AProcess for the desulfurization of flue gasEXXON RESEARCH ENGINEERING CO·Filed 1974·Granted Jan 4, 1977·58 cites·7 claims
- 0492US3939008AUse of perovskites and perovskite-related compounds as battery cathodesEXXON RESEARCH ENGINEERING CO·Filed 1975·Granted Feb 17, 1976·53 cites·13 claims
- 0591US4143214ACells having cathodes containing Cs S cathode-active materialsEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted Mar 6, 1979·53 cites·20 claims
- 0686US5600044AMethod for inhibiting hydrate formationEXXON PRODUCTION RESEARCH CO·Filed 1995·Granted Feb 4, 1997·63 cites·14 claims
- 0785US4626773AMethod and means for determining rock properties using time-domain dielectric spectroscopyEXXON PRODUCTION RESEARCH CO·Filed 1984·Granted Dec 2, 1986·48 cites·34 claims
- 0883US8101907B2Methods for quantitative lithological and mineralogical evaluation of subsurface formationsJACOBI DAVID J·Filed 2006·Granted Jan 24, 2012·21 cites·37 claims
- 0983US4251496AProcess for the removal of SOx and NOx from gaseous mixture containing the sameEXXON RESEARCH ENGINEERING CO·Filed 1979·Granted Feb 17, 1981·35 cites·12 claims
- 1083US4101716AUse of high surface area mixed metal oxides of manganese and calcium in electrochemical processesEXXON RESEARCH ENGINEERING CO·Filed 1977·Granted Jul 18, 1978·21 cites·14 claims
- 1182US4225469AMethod of making lead and bismuth pyrochlore compounds using an alkaline medium and at least one solid reactant sourceEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted Sep 30, 1980·21 cites·42 claims
- 1281US4124539APb2 [M2-x Pbx ]O7-y compounds wherein M is Ru, Ir or mixtures thereof, and method of preparationEXXON RESEARCH ENGINEERING CO·Filed 1977·Granted Nov 7, 1978·21 cites·21 claims
- 1380US4346063ADesulfurization of hot gas with cerium oxideEXXON RESEARCH ENGINEERING CO·Filed 1981·Granted Aug 24, 1982·36 cites·19 claims
- 1480US4152491ACells having cathodes containing carbon monosulfide polymer cathode-active materialsEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted May 1, 1979·30 cites·16 claims
- 1579US4129525AMethod of making lead-rich and bismuth-rich pyrochlore compounds using an alkaline mediumEXXON RESEARCH ENGINEERING CO·Filed 1977·Granted Dec 12, 1978·28 cites·21 claims
- 1678US7615741B2Determining organic carbon downhole from nuclear spectroscopyBAKER HUGHES INC·Filed 2007·Granted Nov 10, 2009·14 cites·23 claims
- 1777US4203871AMethod of making lead and bismuth ruthenate and iridate pyrochlore compoundsEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted May 20, 1980·17 cites·21 claims
- 1876US4146458AElectrochemical device having an oxygen electrode containing a pyrochlore type compound electrocatalystEXXON RESEARCH ENGINEERING CO·Filed 1977·Granted Mar 27, 1979·25 cites·33 claims
- 1976US4130492AMXY3 solid lubricantsEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted Dec 19, 1978·20 cites·37 claims
- 2072US7585816B2Method for inhibiting hydrate formationEXXONMOBIL UPSTREAM RES CO·Filed 2004·Granted Sep 8, 2009·7 cites·35 claims
- 2172US4434031AMethod of electrocatalytic oxidation of organic compoundsEXXON RESEARCH ENGINEERING CO·Filed 1983·Granted Feb 28, 1984·21 cites·28 claims
- 2270US8809798B2Methods to enhance nuclear spectroscopy analysisMENDEZ FREDDY E·Filed 2013·Granted Aug 19, 2014·4 cites·23 claims
- 2370US4176094AMethod of making stoichiometric lead and bismuth pyrochlore compounds using an alkaline mediumEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted Nov 27, 1979·18 cites·27 claims
- 2470US4060500APreparation of mixed metal oxides by decomposition of carbonate solid solutions having the calcite structureEXXON RESEARCH ENGINEERING CO·Filed 1976·Granted Nov 29, 1977·20 cites·45 claims
- 2569US7538319B2Use of thorium-uranium ratio as an indicator of hydrocarbon source rockBAKER HUGHES INC·Filed 2007·Granted May 26, 2009·8 cites·24 claims
- 2669US4876512AMethod for rapidly determining the swelling-clay content in shales and shaly sandstone formations by high-frequency dielectric constant measurementsEXXON PRODUCTION RESEARCH CO·Filed 1988·Granted Oct 24, 1989·25 cites·43 claims
- 2766US4201665AUse of nonstoichiometric carbon-sulfur compounds to remove components from liquidsEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted May 6, 1980·19 cites·45 claims
- 2866US4049790ALayered manganese compound of the formula CA2 MN3 O8EXXON RESEARCH ENGINEERING CO·Filed 1976·Granted Sep 20, 1977·10 cites·2 claims
- 2965US8311744B2Use of chemically and geologically consistent constraints for obtaining elemental chemistry downholeKHISAMUTDINOV ALFRED·Filed 2010·Granted Nov 13, 2012·5 cites·20 claims
- 3057US8573298B2Method for petrophysical evaluation of shale gas reservoirsJACOBI DAVID J·Filed 2008·Granted Nov 5, 2013·5 cites·23 claims
- 3151US4092265AProcess for preventing ecological contamination due to radioactive ruthenium, molybdenum or technetiumEXXON RESEARCH ENGINEERING CO·Filed 1976·Granted May 30, 1978·8 cites·11 claims
- 3250US4192780AMethod of making lead-rich and bismuth-rich pyrochlore compounds using an alkaline medium and a reaction enhancing anodic potentialEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted Mar 11, 1980·10 cites·21 claims
- 3347US4286972AVapor phase adsorption using nonstoichiometric carbon-sulfur compoundsEXXON RESEARCH ENGINEERING CO·Filed 1978·Granted Sep 1, 1981·7 cites·21 claims
- 3446US4388294AOxygen deficient manganese perovskitesEXXON RESEARCH ENGINEERING CO·Filed 1981·Granted Jun 14, 1983·7 cites·14 claims
- 3544US9201160B2Measurement of downhole gamma radiation by reduction of compton scatteringBAKER HUGHES INC·Filed 2013·Granted Dec 1, 2015·0 cites·19 claims
- 3641US11215732B2Geological constraint using probability functions in stochastic mineralogy modelingBAKER HUGHES A GE CO LLC·Filed 2018·Granted Jan 4, 2022·0 cites·14 claims
- 3741US10739326B2Analyzing a rock sampleSAUDI ARABIAN OIL CO·Filed 2018·Granted Aug 11, 2020·0 cites·39 claims
- 3839US4093783ANovel formulations M2 UO2 F2 and their use in electrochemical cellsEXXON RESEARCH ENGINEERING CO·Filed 1977·Granted Jun 6, 1978·2 cites·34 claims
- 3938US4119559AUO2 F2 inclusion compositionsEXXON RESEARCH ENGINEERING CO·Filed 1976·Granted Oct 10, 1978·2 cites·24 claims
Join the waitlist — get patent alerts
Get an alert when John M. Longo files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →