PATENTS

      1579.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Synthesis Catalysts.]  German Patent 686,456. no date.  Schmidt, J., Das Kohlenoxyd, Akad.  Verlagsgesell., Leipzig, 1950. p. 150.

            Sulfides treated with S or with O-free volatile S compounds.