US PATENT SUBCLASS 420 / 77
.~ Four percent or more aluminum containing

Current as of: June, 1999
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420 /   HD   ALLOYS OR METALLIC COMPOSITIONS

8  DF  FERROUS (I.E., IRON BASE) {24}
77.~ Four percent or more aluminum containing {4}
78  DF  .~.~> Over 2 percent silicon containing
79  DF  .~.~> Chromium containing
80  DF  .~.~> Nickel or cobalt containing
81  DF  .~.~> Zirconium, vanadium or titanium containing

DEFINITION

Classification: 420/77

Four percent or more aluminium containing:

(under subclass 8) Alloy or metallic composition which additionally contains 4 percent or more aluminium.