PATENTS

      1664.  ------.  [INTERNATIONAL HYDROCARBON SYNTHESIS Co..] [Hydrocarbon Synthesis.]  French Patent 870,213.  Mar. 5, 1942; appl. filed Feb. 21, 1941.  Chem. Zentralb., 1942, II, p. 1086.

                        Synthesis takes place in tubes 5 m. or more in length, preferably 6-10 m.  With a greater throughput, the same comparative rate of yield is obtained as with the shorter tubes previously used.