Nonflammable hydraulic fluid

Claim 1

AN AIRCRAFT HYDRAULIC FLUID COMPOSITION HAVING SUPERIOR CHARACTERISTICS OF NONFLAMMABILITY CONSISTING ESSENTIALLY OF ABOUT 20 TO 85 PARTS BY WEIGHT OF A NORMALLY LIQUID CHLORINATED ALIPHATIC OLEFIN IN WHICH CHLORINE IS PRESENT IN AN AMOUNT NOT LESS THAN THE CHEMICALLY EQUIVALENT AMOUNT OF HYDROGEN, AND THE CHLORINE IS ATTACHED TO UNSATURATED CARBON ATOMS; AS A CORROSION-INHIBITING AGENT FOR SAID CHLORINATED ALIPHATIC OLEFIN, ABOUT 0.1 TO 20 PARTS OF AN ALKALINE EARTH METAL PHENATE OF MOLECULAR WEIGHT GREATER THAN ABOUT 100, AND SOLUBLE HEREIN; AS A FREEZING POINT DEPRESSING SUBSTANCE, ABOUT 5 TO 20 PARTS OF A MATERIAL OF THE GROUP CONSISTING OF CHLORINATED BENZENE, NAPHTHALENE, AND BIPHENYL, AND MIXTURES THEREOF; AS A VISCOSITY INDEX IMPROVER, ABOUT 0.1 TO 10 PARTS OF AN OIL-SOLUBLE POLYMERIZED ESTER OF ACRYLIC ACID; AS A RUST INHIBITOR, ABOUT 0.1 TO 5 PARTS OF SODIUM WHITE OIL SULFONATE; AND ABOUT 5 TO 50 PARTS OF A REFINED PETROLEUM OIL, HAVING AS A MEASURE OF REFINEMENT AN AROMATIC CARBON ATOM CONTENT OF LESS THAN ABOUT 30 PER CENT; SAID COMPOSITION HAVING A VISCOSITY BETWEEN ABOUT 2 AND 16 CENTISTOKES AT 130*F., AND AN AUTOGENOUS IGNITION TEMPERATURE BETWEEN ABOUT 550*F. AND 1100*F.