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      1134.  ------.  [I. G. FARBENINDUSTRIE A. G.]  [Antiknock Fuel.]  German Patent 720,928, Apr. 16, 1942 (Cl. 23 b-1.04).  Chem. Abs., vol. 37, 1943, p. 2920.

            This fuel is produced by catalytic cracking of heavy benzine or medium oils.  The starting material are passed through a reaction chamber in which the pressure and temperature gradually increase.  The difference in pressure is at least approximately 5 atm. and in temperature at least approximately 10°.

            See also British Patent 521,687 (abs. 1179), and French Patent 857,177 (abs. 1597).