ING Direct has filed a lawsuit alleging that Discover Financial Services has copied the orange sphere designs used in its advertisements and Web pages.

ING Direct, the U.S. online banking unit of the Dutch financial company ING Group NV, said it is the only company that is allowed to use circular, orange logos to market financial services in the United States, according to a trademark-infringement lawsuit filed last week in U.S. District Court for the District of Delaware.

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