Mr. Justice Reed delivered the opinion of the Court. The petitioner sued the respondent for infringement of United States Patents No. 1,392,629, dated October 4, 1921, and No. 1,537,593, dated May 12, 1925. The former was issued to Carbon P. Dubbs; the latter, to Gustav Eg-loff. These patents cover the Dubbs process for converting heavy crude oils to lighter o…
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