Elf France
120Patents
0Active
120Granted
42Portfolio score
Filing activity: Jun 27, 1979 → Jul 21, 1995
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4584064A | Device and installations for the distillation by thin layer evaporation particularly of hydrocarbons, and process for operating this device | Performing Operations; Transporting | 79 | Expired |
| US5096684A | Process for the synthesis of precursors of molecular sieves of the silicoaluminophosphate type, precursors obtained and their application to obtaining the said molecular sieves | Emerging Cross-Sectional Technologies | 75 | Expired |
| US4702338A | Suspension device for a vehicle wheel support arm and front-rear coupling system for said suspension | Performing Operations; Transporting | 57 | Expired |
| US5156231A | Suspension-corrective device designed especially for a motorcycle | Performing Operations; Transporting | 53 | Expired |
| US4834412A | Motorcycle front wheel suspension device | Performing Operations; Transporting | 53 | Expired |
| US4330449A | Process for preparation of compositions of bitumen polymers and products | Chemistry; Metallurgy | 51 | Expired |
| US5001202A | Polymers derived from unsaturated polyesters by addition of compounds with an amine function and their use as additives modifying the properties of petroleum middle distillates when cold | Emerging Cross-Sectional Technologies | 51 | Expired |
| US4417083A | Process for the dehydrocyclization of paraffins at low pressure | Emerging Cross-Sectional Technologies | 45 | Expired |
| US4416806A | Catalyst for production of aromatic hydrocarbons and process for preparation | Chemistry; Metallurgy | 43 | Expired |
| US4574743A | Heat generator for heating a fluid by heat exchange through a fluidized bed and a process for implementing same | Mechanical Engineering; Lighting; Heating | 41 | Expired |
| US4650027A | Coupling device between a front suspension and a rear suspension of a vehicle | Performing Operations; Transporting | 39 | Expired |
| US4890857A | Steerable wheels of land vehicles | Performing Operations; Transporting | 38 | Expired |
| US4993734A | Coupling device between a steerable wheel and a steering control member | Performing Operations; Transporting | 38 | Expired |
| US4652273A | Hydrocarbon middle distillates composition containing nitrogen-containing additives for decreasing its cloud point | Chemistry; Metallurgy | 35 | Expired |
| US4900332A | Nitrogenous copolymers, their preparation and use as additives for improving the pour properties of hydrocarbon middle distillates | Mechanical Engineering; Lighting; Heating | 34 | Expired |
| US4847430A | Process for manufacturing a tertiary alkyl ether by reactive distillation | Emerging Cross-Sectional Technologies | 32 | Expired |
| US5120777A | Bitumen/polymer composition exhibiting an adhesiveness which is retained on storage at elevated temperature and process for preparing such a composition | Chemistry; Metallurgy | 31 | Expired |
| US5382612A | Process for preparing in aqueous emulsion a bitumen/polymer binder with continuous three-dimensional polymeric structure and application of this binder to the production of facings or bituminous mixes | Chemistry; Metallurgy | 30 | Expired |
| US4756547A | Suspension and steering control device for motorcycle | Performing Operations; Transporting | 30 | Expired |
| US4731095A | Nitrogen containing copolymers useful as additives for lowering the cloud point of hydrocarbon middle distillates and compositions containing them | Chemistry; Metallurgy | 30 | Expired |
| US5026459A | Apparatus for reactive distillation | Emerging Cross-Sectional Technologies | 30 | Expired |
| US4567222A | Process for preparing bitumen-polymer compositions, application to these compositions of the obtention of coverings and mother solution of polymer usable for the obtention of the said compositions | Chemistry; Metallurgy | 29 | Expired |
| US4511369A | Copolymers with nitrogen groups, useful as additives for decreasing the cloud point of hydrocarbon middle distillates and compositions containing them | Chemistry; Metallurgy | 29 | Expired |
| US4847431A | Process for manufacturing a tertiary alkyl ether by reactive distillation | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5013407A | Apparatus for reactive distillation | Emerging Cross-Sectional Technologies | 26 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.