The Tokyo Regional Taxation Bureau suspects a man helping a U.S. company negotiate contracts for its cell-phone patents with Japanese makers hid more than 1 billion yen in income and evaded 400 million yen in taxes from 2001 to 2004, sources said Wednesday.

The tax bureau has filed a criminal complaint with prosecutors against Ichiro Nakagawa, 66, who has acted as a de facto agent in Japan for the U.S. firm InterDigital Communications Corp., they said.

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