PATENTS

      1609.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  Use of Purified Iron for Apparatus for Use at High Temperatures and Pressures.  British Patent 293,077, Mar. 3, 1927.  Chem. Abs., vol. 23. 1929. p. 1317.

            Apparatus suitable for use with materials comprising H₂, O₂, or S may be made of iron such as that prepared from mild steel by treatment with H₂ at 900º or with a weakly oxidizing mixture of H₂ and H₂O vapor at 550º-600º and 150 atm. pressure.  The apparatus may be coated with Cr, W, U, Mn, Al, Ag, Cu, or enamel.