Cimiotti Unhairing Co. v. American Fur Refining Co.

Background

The dispute involved the inventor Sutton, who held a patent for a machine that plucks long "water-hairs" from pelts, and a group of makers who used a different unhairing machine. The patent’s validity was not challenged in this case. The machines process pelts (notably sealskins and substitute “coney” rabbit skins) by separating long stiff hairs from the fur so the hairs can be clipped; Sutton’s patent combined a fixed stretcher-bar, feeding mechanism, a stationary card above the bar, a rotary brush below it, and a mechanism to move the brush into position.

Reasoning

The central question was whether the respondents’ machine copied the eighth claim of Sutton’s patent. That claim required five specific parts, including a fixed stretcher-bar and a stationary card. The Court examined how the competing machine actually worked and found important mechanical differences: the respondents used a movable stretcher-bar and a different feeding and drive arrangement, and their compression bar did not function as the claimed stationary card. The Court explained that all elements of a combination claim must be present or have clear equivalents, and here the essential stationary elements were missing or not shown to be equivalent.

Real world impact

Because the Court affirmed that the respondents did not use the claimed fixed stretcher-bar or the stationary card, the respondents may continue to use their movable-stretcher, higher-capacity machine. The decision resolves this infringement dispute without challenging Sutton’s patent validity, and it limits enforcement to the claim’s specific combination of parts.