In 1942, the company bought more than 250,000 acres in the Hugoton-Panhandle gas fields and a 25 percent interest in the Panhandle Eastern Pipeline Co. In 1954, the U.S. Supreme Court decided the landmark case of "Phillips Petroleum vs. State of Wisconsin" which held that under the Natural Gas Act, the federal government should regulate the prices which natural gas producers charge when selling gas at the wellhead. Phillips then divested itself of the Panhandle Eastern Pipeline Interest, but remained a major supplier of natural gas.