United Gas Corporation was a major oil company from its inception in 1930 to its hostile takeover and subsequent forced merger with Pennzoil in 1968. Headquartered in Shreveport, Louisiana, United and its major subsidiaries, Union Producing Company, United Gas Pipeline Company, Atlas Processing, UGC Instruments, and Duval Mining, performed integrated exploration, production, processing, and distribution of oil and natural gas and other raw materials. Second only to Gulf Oil in size and scope, United Gas was one of the first natural gas transmission companies. In 1968, United was merged into Pennzoil, and the firm was renamed Pennzoil United, Inc. The retail gas distribution assets of United were spun off into Entex Energy in 1970. United Gas Pipeline stock was distributed to Pennzoil share