Assignee
ELF AQUITAINE
496 granted patents·10,692 citations·filing 1975–1999
Top patents by PatentIndex Score
496 records- 0197US4739018APolycarbon sulphide polymersELF AQUITAINE·Filed 1984·Granted Apr 19, 1988·158 cites·4 claims
- 0296US4686653AMethod and device for making geophysical measurements within a wellboreELF AQUITAINE·Filed 1984·Granted Aug 11, 1987·167 cites·16 claims
- 0394US5068445AProcess for the preparation of organic disulphides and polysulphidesELF AQUITAINE·Filed 1989·Granted Nov 26, 1991·45 cites·17 claims
- 0493US4851307AIonically conductive materialELF AQUITAINE·Filed 1987·Granted Jul 25, 1989·56 cites·23 claims
- 0593US4758483ANovel macromolecular material for use in realizing electrolytes and/or electrodesELF AQUITAINE·Filed 1985·Granted Jul 19, 1988·96 cites·24 claims
- 0692US5256821AMethod of synthesis of sulphonylimidesELF AQUITAINE·Filed 1993·Granted Oct 26, 1993·42 cites·22 claims
- 0792US4952740ACyclic phosphonitesELF AQUITAINE·Filed 1989·Granted Aug 28, 1990·75 cites·14 claims
- 0892US4578326ANovel macromolecular material for use in realizing electrolytes and/or electrodesELF AQUITAINE·Filed 1984·Granted Mar 25, 1986·60 cites·36 claims
- 0991US4120655AMethod for the inhibition of corrosion of ferrous metals in an aqueous mediumELF AQUITAINE·Filed 1977·Granted Oct 17, 1978·51 cites·6 claims
- 1090US5250784AMethod and device for cutting a multilayer assembly composed of a plurality of thin films and comprising a thin film electrochemical generator or a component part thereofELF AQUITAINE·Filed 1991·Granted Oct 5, 1993·90 cites·20 claims
- 1190US4842081ASimultaneous drilling and casing deviceELF AQUITAINE·Filed 1988·Granted Jun 27, 1989·187 cites·6 claims
- 1290US4513816ASealing system for a well bore in which a hot fluid is circulatedELF AQUITAINE·Filed 1984·Granted Apr 30, 1985·373 cites·32 claims
- 1390US4478720AFractionation process for mixtures by elution chromatography with liquid in supercritical state and installation for its operationELF AQUITAINE·Filed 1983·Granted Oct 23, 1984·63 cites·14 claims
- 1489US6011334AIn-line fluid-driven electric power generatorELF AQUITAINE·Filed 1997·Granted Jan 4, 2000·185 cites·2 claims
- 1589US5630906AProcess for the delignifcation and bleaching of a lignocellulose materialELF AQUITAINE·Filed 1993·Granted May 20, 1997·53 cites·13 claims
- 1689US5421165AProcess for denitrogenation of a feedstock of a liquefied mixture of hydrocarbons consisting chiefly of methane and containing at least 2 mol % of nitrogenELF AQUITAINE·Filed 1992·Granted Jun 6, 1995·78 cites·13 claims
- 1789US4399112AProcess for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS2 and the mercaptans and possibility at least one member of the groupELF AQUITAINE·Filed 1981·Granted Aug 16, 1983·62 cites·17 claims
- 1889US4155405APrevention of inflow of water into wells or shafts which have already been drilled or are being drilledELF AQUITAINE·Filed 1977·Granted May 22, 1979·52 cites·16 claims
- 1989US4121806AApparatus for compensating variations of distanceELF AQUITAINE·Filed 1977·Granted Oct 24, 1978·90 cites·4 claims
- 2088US5209914ALiquid absorbing acidic gases and use thereof of in deacidification of gasesELF AQUITAINE·Filed 1989·Granted May 11, 1993·60 cites·23 claims
- 2188US4935043ACryogenic process for desulphurization and gasoline removal of a gaseous mixture comprising methane containing H2 S and hydrocarbons having 2 carbon atoms and higherELF AQUITAINE·Filed 1988·Granted Jun 19, 1990·39 cites·20 claims
- 2288US4573541AMulti-drain drilling and petroleum production start-up deviceELF AQUITAINE·Filed 1984·Granted Mar 4, 1986·235 cites·11 claims
- 2388US4549584AProcess and device for filling chromatography columnsELF AQUITAINE·Filed 1983·Granted Oct 29, 1985·67 cites·18 claims
- 2488US4159437AX-ray emitter tube having an anode window and method of using sameELF AQUITAINE·Filed 1977·Granted Jun 26, 1979·34 cites·13 claims
- 2588US4139417ALubricating oil compositions containing copolymers of olefins or of olefins and non-conjugated dienes with unsaturated derivatives of cyclic imidesELF AQUITAINE·Filed 1977·Granted Feb 13, 1979·45 cites·16 claims
- 2687US5940777AAutomatic seismic pattern recognition methodELF AQUITAINE·Filed 1996·Granted Aug 17, 1999·101 cites·17 claims
- 2787US4735747AProcess and apparatus for the photochemical sulphochlorination of gaseous alkanesELF AQUITAINE·Filed 1986·Granted Apr 5, 1988·34 cites·13 claims
- 2887US4061690AMethod of catalytic conversion of butaneELF AQUITAINE·Filed 1976·Granted Dec 6, 1977·20 cites·16 claims
- 2986US5788000AStabilizer-reamer for drilling an oil wellELF AQUITAINE·Filed 1996·Granted Aug 4, 1998·147 cites·8 claims
- 3086US5538867AProcess for the electrochemical regeneration of pyridine cofactorsELF AQUITAINE·Filed 1994·Granted Jul 23, 1996·80 cites·19 claims
- 3186US4587306APreparation of polymers of hydroxamic functionsELF AQUITAINE·Filed 1983·Granted May 6, 1986·38 cites·12 claims
- 3286US4194857ASubsea stationELF AQUITAINE·Filed 1978·Granted Mar 25, 1980·65 cites·7 claims
- 3386US4120362ASubsea stationELF AQUITAINE·Filed 1976·Granted Oct 17, 1978·68 cites·16 claims
- 3485US4550216ACatalyst for the metathesis of olefinsELF AQUITAINE·Filed 1984·Granted Oct 29, 1985·18 cites·12 claims
- 3585US4423635ASystem of analysis by visual display of the vibratory movements of a rotary machineELF AQUITAINE·Filed 1982·Granted Jan 3, 1984·56 cites·22 claims
- 3684US5233304AElectromagnetic source integrated into an element of a well casingELF AQUITAINE·Filed 1990·Granted Aug 3, 1993·78 cites·21 claims
- 3784US4394320ASynthesis of stannic tetra mercaptidesELF AQUITAINE·Filed 1982·Granted Jul 19, 1983·16 cites·11 claims
- 3884US4095649AReentry system for subsea well apparatusELF AQUITAINE·Filed 1977·Granted Jun 20, 1978·57 cites·16 claims
- 3983US5493058ASynthesis of methyl mercaptan from dimethyl disulphideELF AQUITAINE·Filed 1994·Granted Feb 20, 1996·25 cites·13 claims
- 4083US5310534AProcess for dealuminization of the synthetic zeolites of large pores, catalysts and selective organophilic adsorbents containing the dealuminized zeolites obtained according to the process and essentially silicic beta zeoliteELF AQUITAINE·Filed 1991·Granted May 10, 1994·44 cites·21 claims
- 4183US4120171AApparatus and method of connecting a flexible line to a subsea stationELF AQUITAINE·Filed 1977·Granted Oct 17, 1978·43 cites·12 claims
- 4282US5100746AProcess for production of a multi-layer assembly for an electrochemical generatorELF AQUITAINE·Filed 1988·Granted Mar 31, 1992·42 cites·56 claims
- 4382US4718048AMethod of instantaneous acoustic logging within a wellboreELF AQUITAINE·Filed 1985·Granted Jan 5, 1988·52 cites·9 claims
- 4482US4596699AApparatus for burning hydrogen sulphideELF AQUITAINE·Filed 1980·Granted Jun 24, 1986·26 cites·3 claims
- 4582US4133182AApparatus and method of connecting a flowline to a subsea stationELF AQUITAINE·Filed 1977·Granted Jan 9, 1979·45 cites·7 claims
- 4681US6011094AProcess for the preparation of bitumen-polymer compositions containing a crosslinked elastomer and a functionalized olefinic polymerELF AQUITAINE·Filed 1995·Granted Jan 4, 2000·48 cites·34 claims
- 4781US5508013AProcess for the production of sulphur from at least one sour gas containing hydrogen sulphide and a fuel effluent and thermal reactorELF AQUITAINE·Filed 1994·Granted Apr 16, 1996·39 cites·12 claims
- 4881US4805697AMethod of pumping hydrocarbons from a mixture of said hydrocarbons with an aqueous phase and installation for the carrying out of the methodELF AQUITAINE·Filed 1987·Granted Feb 21, 1989·71 cites·16 claims
- 4981US4683181AElectrochemical generator with composite electrodeELF AQUITAINE·Filed 1985·Granted Jul 28, 1987·48 cites·16 claims
- 5081US4143052AProcess for preparing thiophenesELF AQUITAINE·Filed 1977·Granted Mar 6, 1979·14 cites·15 claims
Showing the top 50 of 496 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when ELF AQUITAINE files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →