Conoco, formerly known as Continental Oil, is an American petroleum brand that has been operating under the ownership of the Phillips 66 Company since 2012. It is headquartered in the Westchase neighborhood of Houston, Texas. The brand is one of the several successors of the original Standard Oil Company. Continental Oil was a subsidiary of Standard Oil from 1884 until 1911 when the Supreme Court of the United States, in an anti-trust legal case, ruled to decouple and break up the monopolized entity of Standard Oil.