Oasis Research, an inscrutable little company with an East Texas address, sued more than a dozen tech companies in Marshall federal district court last year for allegedly infringing its patents. Those patents, as radio program “This American Life” reported last month, were assigned to Oasis by the patent-holding behemoth Intellectual Ventures, which retains a stake in any income the patents generate.

On Tuesday Oracle Corp., which wasn’t among the companies sued by Oasis Research last year, sued Oasis in federal district court in Delaware, seeking declaratory judgment that all six of Oasis’ patents are invalid and not infringed. Oracle’s lawyers at Kirkland & Ellis, led by Steven Cherny, assert that Oasis tried to shake down their client in a May 2011 letter claiming that Oracle was infringing “at least” two of its patents and demanding that Oracle pay licensing fees.

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