26
Opinion of the Court
This litigation followed after the patents expired and a competitor, TrafFix Devices, Inc., sold sign stands with a visible spring mechanism that looked like MDI's. MDI and TrafFix products looked alike because they were. When TrafFix started in business, it sent an MDI product abroad to have it reverse engineered, that is to say copied. Complicating matters, TrafFix marketed its sign stands under a name similar to MDI's. MDI used the name "WindMaster," while TrafFix, its new competitor, used "WindBuster."
MDI brought suit under the Trademark Act of 1946 (Lanham Act), 60 Stat. 427, as amended, 15 U. S. C. § 1051 et seq., against TrafFix for trademark infringement (based on the similar names), trade dress infringement (based on the copied dual-spring design), and unfair competition. TrafFix counterclaimed on antitrust theories. After the United States District Court for the Eastern District of Michigan considered cross-motions for summary judgment, MDI prevailed on its trademark claim for the confusing similarity of names and was held not liable on the antitrust counterclaim; and those two rulings, affirmed by the Court of Appeals, are not before us.
I
We are concerned with the trade dress question. The District Court ruled against MDI on its trade dress claim. 971 F. Supp. 262 (ED Mich. 1997). After determining that the one element of MDI's trade dress at issue was the dual-spring design, id., at 265, it held that "no reasonable trier of fact could determine that MDI has established secondary meaning" in its alleged trade dress, id., at 269. In other words, consumers did not associate the look of the dual-spring design with MDI. As a second, independent reason to grant summary judgment in favor of TrafFix, the District Court determined the dual-spring design was functional. On this rationale secondary meaning is irrelevant because there can be no trade dress protection in any event. In ruling on the functional aspect of the design, the District Court
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