PORTLAND, Ore. (AP) - Nike Inc. has sued Wal-Mart Stores Inc., alleging the giant retailer is selling shoes that infringe on Nike's patented designs.

Nike says in its complaint, filed Monday, that the Wal-Mart shoes too closely resemble its Nike Shox footwear. Those shoes have a spring-like device in the heel.

Nike wants Wal-Mart to stop selling the shoes and seeks damages, according to the complaint filed federal court in Illinois.

Wal-Mart said it does not comment on pending litigation.

Nike does not sell its own product in Wal-Mart and has long argued that its brand would be devalued if sold in discount chains.

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