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FULLER v. YENTZER

94 U.S. 299 (1876)

FULLER v. YENTZER. SAME v. GOODRICH.

Supreme Court of United States.

Attorney(s) appearing for the Case

Mr. E.B. Barnum and Mr. E.N. Dickerson for the appellants.

Mr. Walter B. Scates, contra.

MR. JUSTICE CLIFFORD delivered the opinion of the court.

Modifications or alterations in an invention consisting in a combination of old ingredients, which merely substitutes another old ingredient for one of the ingredients in the patented combination, is an infringement of the patent, if the substitute performs the same function and was well known at the date of the patent as a proper substitute for the one omitted from the patented invention; but the rule is otherwise...

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