95 U.S. 214 (____)


Supreme Court of United States.

Attorney(s) appearing for the Case

Mr. Arthur v. Briesen for the appellant.

Mr. Frederic H. Betts, contra.

MR. JUSTICE CLIFFORD delivered the opinion of the court.

Patentees or assignees in a suit for infringement, where the patent described in the bill of complaint is introduced in evidence, are presumed to be the original and first inventors of the described improvement; and, if they have proved the alleged infringement, the burden of proof is cast upon the respondents to show that the patent is invalid, unless the patent is materially defective in form.


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