 Meanwhile, Humble gradually built up new and rebranded service stations in California and other western states under the Enco brand and purchased a large number of stations from Signal Oil Company in 1967, followed by the opening of a new refinery in Benicia, California, in 1969.In 1966, the Justice Department ordered Humble to "cease and desist" from using the Esso brand at stations in several Southeastern states following protests from Standard Oil of Kentucky (a Standard Oil of California subsidiary by that time and in the process of rebranding the Kyso stations as Chevron).By 1967, stations in each of those states were rebranded as Enco.