Microsoft Files U.S. Antitrust Suit Against InterDigital

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Microsoft Corp. is claiming InterDigital Inc. has been violating its pledge to offer fair and reasonable licenses on patents related to fundamental mobile-phone technology.

The company filed an antitrust lawsuit Thursday in federal court in Wilmington, Delaware, a week before a U.S. trade agency is set to rule on a long-running dispute on whether Microsoft-made Nokia phones infringed its patents and should be blocked from the U.S.