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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