In "Zenith Radio Corp. v. Hazeltine Research, Inc." the Supreme Court established that demanding a percentage of a licensees patented and non-patented product sales in exchange for a license was misuse. Hazeltine Research required Zenith pay a total percentage of all its sales to license Hazeltine's patents. The court ruled that this license requirement was patent misuse, even though it might not be an antitrust violation because the anticompetive impact may have been too slight. This holding reaffirmed a line of Supreme Court patent misuse decisions holding that the competitive impact of a restrictive practice might fall short of an antitrust violation and nonetheless be misuse.