http://en.wikipedia.org/wiki/United_States_trademark_law trademarks trademark law (en) Wikipedia Trademark protection trademark law (en) du Pont factors trademark confusion trademarks overview United States U.S. trademark trademarks DuPont factors du Pont factors trademarks trademarks trademark infringement action according to Wikipedia Wikipedia trademark confusion http://en.wikipedia.org/wiki/United_..._trademark_law Wikipedia U.S. trademark law United States (en) United States trademark law until 1870