1800. ------. [KARWAT, E.] (Gesellschaft für Linde’s Eismaschinen A. G.). [Separating Gaseous Impurities.] German Patent 707,079, May 8, 1941 (Cl. 12 i-1.01). Chem. Abs., vol. 36, 1942, p. 1817.

Describes layout for separating gaseous impurities from gaseous mixtures by freezing.