MR. JUSTICE MILLER delivered the opinion of the court.
The appellant in this case, who was complainant in the Circuit Court, obtained a patent, in May, 1869, for a new and useful invention, which relates to the heavy hydrocarbon oils; and he sued the appellees, who were defendants in that court, for an infringement of his patent.
The defendants were dealers in oils, and not manufacturers of them. If the appellant's patent was for a new oil, the product of...
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