US PATENT SUBCLASS 148 / 321
.~.~ 1.7 percent or more carbon containing (e.g., cast iron)

Current as of: June, 1999
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148 /   HD   METAL TREATMENT

400  DF  STOCK {20}
320  DF  .~ Ferrous (i.e., iron base) {10}
321.~.~ 1.7 percent or more carbon containing (e.g., cast iron) {3}
322  DF  .~.~.~> Malleabilized
323  DF  .~.~.~> Chill cast
324  DF  .~.~.~> Six percent or more group IV, V or VI transition metal containing

DEFINITION

Classification: 148/321

1.7 Percent or more carbon containing (e.g., cast iron):

(under subclass 320) Stock material which additionally contains 1.7 percent or more carbon.

(1) Note. Most so called "cast iron" contains over 1.7 percent carbon. A patent claiming "cast iron" will be placed in this or indented subclasses in the absence of a specific disclosure that the carbon content is less than 1.7 percent.