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Return to Abstracts of Patents Return to Abstracts of Patents 250-499 Patent Abstracts490. ------. [DIDIER-WERKE A. G.] Coking Process; Retort Furnaces. British Patent 470,275, Aug. 12, 1937. Chem. Abs., vol. 32, 1938, p. 1080. Gas mixtures containing H2 and CO in proportions suitable for use in chemical processes such as destructive hydrogenation, are obtained in continuously operating, externally heated vertical retorts in which the time of contact of the reacting gases with the fuel is controlled by varying the position at which the gases are withdrawn. |