Dwight & Lloyd Sintering Co. v. Greenawalt

(after stating the facts as above). The patents in suit relate to “sintering” of fine ores; that is, their treatment with heat, by which they are agglomerated into cohesive porous masses, suitable for reduction in a blast furnace. The Huntington and Haberlein process patent, No. 786,814 (April 11, 1905), was the best method of sintering prior to Dwight & Lloyd patent, No. 882,517 (March 17, 1908). This process was capable of producing some sintered material, but in the mass the product was unsatisfactory in composition and costly to handle. It was produced in great pots, in which tons of ore…