Summary

Joseph McKenna Leeds Catlin Company v. Victor Talking Machine Company…

Certainly, one element is not the combination, nor, in any proper sense, can it be regarded as a substantive part of the invention represented by the combination, and it can make no difference whether the element was always free or becomes free by the expiration of a prior patent, foreign or domestic. In making a combination, an inventor has the whole field of mechanics to draw from.
Source: Wikisource

Joseph McKenna Leeds Catlin Company v. Victor Talking Machine Company…

In such cases the patent does not stand or fall as a unity. If claims may be separable, as in the case of infringement of some and not of others,-if claims can be separable, though some are invalid,-may they not be separable when some of them have expired? Certainly confusion cannot arise in one case more than in the other. Confusion might result in such circumstances as were presented in Siemen v. Sellers, where it was sought to extend the principal invention-indeed the only invention-by the date of a mere formal improvement of it.
Source: Wikisource

Joseph McKenna Leeds Catlin Company v. Victor Talking Machine Company…

Upon the expiration of a patent, it is argued, all of its claims expire, since, as this court said in Siemen v. Sellers, as it is contended, a patent cannot be considered as running partly to one date and partly to another, for this would be productive of endless confusion. In other words, a patent cannot expire in parcels, it cannot have a plurality of terms. Therefore it is contended that it is the patent, and not the separate claims thereof, which are by the statute limited to expire with the foreign patent.
Source: Wikisource

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