A federal judge in Washington State has granted class-action status to a lawsuit filed against First USA Inc., a credit card unit of Bank One Corp. of Chicago, that alleges fraud and violations of federal law in the way it fixed interest rates on individual accounts.

The case potentially involves 10 million of First USA's credit card customers and could bring $1 billion in damages, a lawyer in the case said. Judge Robert S. Lasnik of the U.S. District Court for the Western District of Washington, made his ruling this week.

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