Elf Union
20Patents
0Active
20Granted
31Portfolio score
Filing activity: Aug 30, 1976 → May 29, 1980
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4104320A | Method of dehydrocyclizing aliphatic hydrocarbons | Chemistry; Metallurgy | 149 | Expired |
| US4145322A | Process for preparing bitumen-polymer compositions | Emerging Cross-Sectional Technologies | 87 | Expired |
| US4242246A | Process for the preparation of bituminous compositions making use of a mother solution containing polymers and sulfur | Chemistry; Metallurgy | 63 | Expired |
| US4154710A | Method of preparing novel bitumen compositions | Chemistry; Metallurgy | 24 | Expired |
| US4233186A | Catalysts for water dealkylation of aromatic hydrocarbons | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4238451A | Process and device to measure the asphaltene content of petroleum products | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4096908A | Heating and cooling enclosure for a gas chromatographic column | Physics | 16 | Expired |
| US4201193A | Solar energy absorbing roof | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4221259A | Process for storing calories | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4237052A | Method for the preparation of bitumens modified by polymers | Chemistry; Metallurgy | 11 | Expired |
| US4264334A | Heavy fuel-oil compositions having an improved stability under storage conditions | Chemistry; Metallurgy | 8 | Expired |
| US4242143A | Process for improving the properties of bituminous products and an improved cast asphalt | Emerging Cross-Sectional Technologies | 5 | Expired |
| US4165631A | Instrument for the continuous measurement of viscosity, especially of bitumens | Physics | 5 | Expired |
| US4238368A | Water dealkylation catalyst of aromatic hydrocarbons | Chemistry; Metallurgy | 3 | Expired |
| US4164490A | Bitumen compositions containing polymers | Chemistry; Metallurgy | 2 | Expired |
| US4191702A | Preparation of alkyl or aralkyl thiosulfates | Chemistry; Metallurgy | 1 | Expired |
| US4182296A | Apparatus permitting an improvement of the carburetion of internal combustion engines | Emerging Cross-Sectional Technologies | 1 | Expired |
| US4311614A | Catalysts for water dealkylation of aromatic hydrocarbons | Chemistry; Metallurgy | 1 | Expired |
| US4206044A | Catalytic process for hydro-treating gas oils in the presence of hydrogen | Chemistry; Metallurgy | 0 | Expired |
| US4206037A | Catalytic treatment of gas oils | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.