Keplinger v. De Young

This was a suit commenced-by the plaintiff, Keplinger, in the Fourth Circuit for the District of Maryland, against the defendant, for the violation of the plaintiff’s patent right, secured to him according to law, in a certain new and useful improvement, to wit, a machine for making watch chains, &b. . The third count , in the declaration, upon which alone this cause has been argued, is in. the usual form, charging the defendant with having Unlawfully used the said improvement, without the consent of the plaintiff first had and obtained in writing. The defendant pleaded the general issue, and…