Nvidia Corporation, whose graphics chips help run video games, said it won’t negotiate with Rambus Inc. after losing a U.S. trade agency decision that it violated three Rambus-owned patents. “Rambus and Nvidia talked for eight years before they sued us,” David Shannon, Nvidia’s general counsel, said in an interview yesterday in Washington. “I don’t think it’s realistic to think that there’s going to be an agreement any time soon between the two companies.”

Judge Theodore Essex with the U.S. International Trade Commission in Washington said Nvidia infringed three Rambus patents, while two others are invalid. His finding is subject to review by the six-member commission and, if upheld, could lead to a ban on imports of Nvidia chips and products that use them, including some computers made by Hewlett-Packard Co. Shannon said it won’t reach that point.

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