Elf Union
Records under this name other than patents Elf Union holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 4,096,908 | Heating and cooling enclosure for a gas chromatographic column Term ended Term ended no later than Jun 27, 1998 · Low confidence | Term ended | Term ended no later than Jun 27, 1998 | Low confidence |
| US 4,104,320 | Method of dehydrocyclizing aliphatic hydrocarbons Formerly held Term ended Term ended no later than Aug 1, 1998 · Low confidence | Term ended | Term ended no later than Aug 1, 1998 | Low confidence |
| US 4,145,322 | Process for preparing bitumen-polymer compositions Term ended Term ended no later than Mar 20, 1999 · Low confidence | Term ended | Term ended no later than Mar 20, 1999 | Low confidence |
| US 4,154,710 | Method of preparing novel bitumen compositions Term ended Term ended no later than May 15, 1999 · Low confidence | Term ended | Term ended no later than May 15, 1999 | Low confidence |
| US 4,164,490 | Bitumen compositions containing polymers Term ended Term ended no later than Aug 14, 1999 · Low confidence | Term ended | Term ended no later than Aug 14, 1999 | Low confidence |
| US 4,165,631 | Instrument for the continuous measurement of viscosity, especially of bitumens Term ended Term ended no later than Aug 28, 1999 · Low confidence | Term ended | Term ended no later than Aug 28, 1999 | Low confidence |
| US 4,182,296 | Apparatus permitting an improvement of the carburetion of internal combustion engines Term ended Term ended no later than Jan 8, 2000 · Low confidence | Term ended | Term ended no later than Jan 8, 2000 | Low confidence |
| US 4,191,702 | Preparation of alkyl or aralkyl thiosulfates Term ended Term ended no later than Mar 4, 2000 · Low confidence | Term ended | Term ended no later than Mar 4, 2000 | Low confidence |
| US 4,201,193 | Solar energy absorbing roof Term ended Term ended no later than May 6, 2000 · Low confidence | Term ended | Term ended no later than May 6, 2000 | Low confidence |
| US 4,206,037 | Catalytic treatment of gas oils Term ended Term ended no later than Jun 3, 2000 · Low confidence | Term ended | Term ended no later than Jun 3, 2000 | Low confidence |