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Unocal Corp said that its Union Oil Co of California (Union Oil) subsidiary has filed suit against Valero Energy Corp (Valero) for wilful infringement of Union Oil's '393 and '126 gasoline patents. These patents cover certain compositions of cleaner-burning motor gasolines. The '393 patent was litigated at length in an earlier case and upheld with a royalty rate of 5.75 cts/gallon imposed on the defendants. The complaint …