US PATENT SUBCLASS 420 / 13
.~.~ 2.7 percent or more carbon equivalent containing (i.e., cast iron)

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

8  DF  FERROUS (I.E., IRON BASE) {24}
9  DF  .~ 1.7 percent or more carbon containing {2}
13.~.~ 2.7 percent or more carbon equivalent containing (i.e., cast iron) {7}
14  DF  .~.~.~> Boron containing
15  DF  .~.~.~> Chromium containing {1}
18  DF  .~.~.~> Processes of adding magnesium {7}
26  DF  .~.~.~> Copper containing
27  DF  .~.~.~> Nickel or molybdenum containing
28  DF  .~.~.~> Over .1 percent aluminum containing
29  DF  .~.~.~> Processes {4}

DEFINITION

Classification: 420/13

2.7 percent or more carbon equivalent containing:

(under subclass 9) Alloy or metallic composition in which the total of the carbon content plus one third the silicon content plus one sixth the phosphorus content is 2.7 percent or more, i.e., cast iron.

(1) Note. The recitation "cast iron" shall be taken a indicating a carbon equivalent of 2.7 percent or more in the absence of a specific disclosure to the contrary.