Pittsburgh Coal Washer Co. v. Slag Rock Mach. Co.

BUFFINGTON, Circuit Judge.

This case concerns mechanical conveyors adapted to receive molten metal from blast furnaces into a series of moving molds of a pattern to form pig iron, carry the metal forward as it congeals, discharge it, return the metal mold again to the furnace mouth, and continuously repeat the process. Reference to the case, in this circuit, of American Casting Machine Co. v. Pittsburgh Coal Washer Co., 237 Fed. 590, 150 C. C. A. 472, will give a general view of the art and obviate present repetition. From the date of the patents involved in that case, which were granted in…