CLEVENGER, Circuit Judge.
In this appeal, we consider to what extent federal patent law preempts state law causes of action prohibiting tortious activities in the marketplace, when to prevail on them, the plaintiff must prove that a United States patent is either invalid or unenforceable. In addition, we consider whether, under 28 U.S.C. § 1338, such state law causes of action arise under federal patent law for purposes of exclusive federal jurisdiction over...
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