Lincoln Engineering of Illinois v. Stewart-Warner Corp. (303 U.S. 545, 1938 Mar 28)

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[NOVEL] {1} We conclude that Butler's effort, by the use of a combination claim, to extend the monopoly of his invention of an improved form of chuck or coupler to old parts or elements having no new function when operated in connection with the coupler renders the claim void. [In an earlier case, in the inventor's] combination, [one element] the disc not only performed a new function but performed it in combination with another new element - the swinging arm which carried the needle.

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