PATENTS 151. BAUM, K. (Didier-Werke A. G.). [Continuously Operated Vertical Chamber Oven for the Production of Synthesis Gas by the Direct-Current Method.] German Patent 715,531, Nov. 27, 1941; appl. D. 74,918, filed March 1937 (Cl. 26a-8.01). Chem. Abs., vol. 38, 1944, p. 2189. |