Assignee
DELTA CENTRAL REFINING INC
6 granted patents·109 citations·filing 1980–1984
Top patents by PatentIndex Score
6 records- 0181US4360420ADistillation and solvent extraction process for rerefining used lubricating oilDELTA CENTRAL REFINING INC·Filed 1980·Granted Nov 23, 1982·33 cites·29 claims
- 0279US4399025ASolvent extraction process for rerefining used lubricating oilDELTA CENTRAL REFINING INC·Filed 1981·Granted Aug 16, 1983·29 cites·13 claims
- 0368US4342645AMethod of rerefining used lubricating oilDELTA CENTRAL REFINING INC·Filed 1980·Granted Aug 3, 1982·19 cites·20 claims
- 0454US4439311ARerefining used lubricating oil with hydride reducing agentsDELTA CENTRAL REFINING INC·Filed 1982·Granted Mar 27, 1984·11 cites·17 claims
- 0552US4302325ASolvent extraction process for rerefining used lubricating oilDELTA CENTRAL REFINING INC·Filed 1980·Granted Nov 24, 1981·11 cites·13 claims
- 0642US4504383ARerefining used oil with borohydride reducing agentsDELTA CENTRAL REFINING INC·Filed 1984·Granted Mar 12, 1985·6 cites·13 claims
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