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ENERGY

<i> Times Staff and Wire Reports</i>

Unocal Files Countersuit Against Six Oil Firms: Los Angeles-based Unocal Corp. said the counterclaim filed in U.S. District Court seeks to prohibit other oil companies from violating its patents as they gear up to produce “reformulated” gasoline under a California law that goes into effect in 1996. Chevron Corp., Exxon Corp., Mobil Corp., Shell Oil Co., Texaco Inc. and Atlantic Richfield Co. sued Unocal seeking a judgment that its patents were invalid. The oil firms say the gasoline can’t be patented because it’s not new and because it’s required by the California Air Resources Board.

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