PER CURIAM.
The judgments are affirmed by an equally divided Court.
MR. JUSTICE BLACK, with whom MR. JUSTICE DOUGLAS joins, dissenting.
In this case respondents sued petitioner for payments alleged to be due under a patent-licensing agreement. At trial and on appeal petitioner defended primarily on the ground that its product did not involve any use of the respondent's patent. Petitioner did not at any time attack the validity of the patent itself...
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