Societe Nationale Elf Aquitaine
449Patents
0Active
449Granted
42Portfolio score
Filing activity: Jul 7, 1975 → Oct 6, 1995
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4513816A | Sealing system for a well bore in which a hot fluid is circulated | Emerging Cross-Sectional Technologies | 280 | Expired |
| US4842081A | Simultaneous drilling and casing device | Fixed Constructions | 159 | Expired |
| US4573541A | Multi-drain drilling and petroleum production start-up device | Fixed Constructions | 146 | Expired |
| US5016710A | Method of assisted production of an effluent to be produced contained in a geological formation | Fixed Constructions | 136 | Expired |
| US4739018A | Polycarbon sulphide polymers | Emerging Cross-Sectional Technologies | 126 | Expired |
| US4686653A | Method and device for making geophysical measurements within a wellbore | Physics | 113 | Expired |
| US5465323A | Method for modelling a surface and device for implementing same | Physics | 87 | Expired |
| US5272925A | Motorized rotary swivel equipped with a dynamometric measuring unit | Fixed Constructions | 82 | Expired |
| US4505997A | Bis perhalogenoacyl -or sulfonyl-imides of alkali metals, their solid solutions with plastic materials and their use to the constitution of conductor elements for electrochemical generators | Emerging Cross-Sectional Technologies | 77 | Expired |
| US4157730A | System for the storage and recovery of heat in a captive layer | Emerging Cross-Sectional Technologies | 72 | Expired |
| US4758483A | Novel macromolecular material for use in realizing electrolytes and/or electrodes | Electricity | 72 | Expired |
| US5250784A | Method 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 thereof | Emerging Cross-Sectional Technologies | 58 | Expired |
| US4478720A | Fractionation process for mixtures by elution chromatography with liquid in supercritical state and installation for its operation | Emerging Cross-Sectional Technologies | 50 | Expired |
| US4578326A | Novel macromolecular material for use in realizing electrolytes and/or electrodes | Electricity | 50 | Expired |
| US4976117A | Device and process for producing cold and/or heat by solid-gas reaction | Mechanical Engineering; Lighting; Heating | 49 | Expired |
| US4805697A | Method of pumping hydrocarbons from a mixture of said hydrocarbons with an aqueous phase and installation for the carrying out of the method | Fixed Constructions | 48 | Expired |
| US4952740A | Cyclic phosphonites | Chemistry; Metallurgy | 44 | Expired |
| US4944159A | Process for producing cold by solid-gas reaction and device pertaining thereto | Mechanical Engineering; Lighting; Heating | 44 | Expired |
| US4851307A | Ionically conductive material | Electricity | 44 | Expired |
| US5141061A | Method and equipment for drilling control by vibration analysis | Fixed Constructions | 44 | Expired |
| US4120362A | Subsea station | Fixed Constructions | 43 | Expired |
| US5213162A | Submarine wellhead | Fixed Constructions | 42 | Expired |
| US4139417A | Lubricating oil compositions containing copolymers of olefins or of olefins and non-conjugated dienes with unsaturated derivatives of cyclic imides | Chemistry; Metallurgy | 42 | Expired |
| US4757314A | Apparatus for the control and monitoring of a well head submerged in a liquid | Fixed Constructions | 40 | Expired |
| US4399112A | Process for the catalytic incineration of residual gases containing a low content of at least one sulfur compound selected from COS, CS.sub.2 and the mercaptans and possibility at least one member of the group | Chemistry; Metallurgy | 39 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.