US PATENT SUBCLASS 428 / 684
.~.~.~.~.~ Containing 0.01-1.7% carbon (i.e., steel)

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

544  DF  ALL METAL OR WITH ADJACENT METALS {31}
615  DF  .~ Composite; i.e., plural, adjacent, spatially distinct metal components (e.g., layers, joint, etc.) {15}
655  DF  .~.~ Transition metal-base component {4}
668  DF  .~.~.~ Group VIII or IB metal-base component {10}
681  DF  .~.~.~.~ Fe-base component {2}
684.~.~.~.~.~ Containing 0.01-1.7% carbon (i.e., steel) {1}
685  DF  .~.~.~.~.~.~> Containing more than 10% nonferrous elements (e.g., high alloy, stainless)

DEFINITION

Classification: 428/684

(under subclass 681) Subject matter in which the iron-base component contains 0.01 to 1.7 percent carbon.

(1) Note. The mere designation of a component as "steel" is sufficient for classification in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

619, to complete a search for this subject matter.

SEE OR SEARCH CLASS

29, Metal Working,

4.51+, for shredding metal or metal wool article making. 76, Metal Tools and Implements, Making,

84, for butcher's steel.

148, Metal Treatment,

543, 545 and 612-618 for processes of treating solid iron based alloys containing greater than 1.7 per cent carbon to modify or maintain the internal physical structure (i.e., microstructure) or chemical properties of metal. If metal casting, fusion bonding, machining, or working is involved, there is a requirement of significant heat treatment as described in the Class 148 definition.

420, Alloys or Metallic Composition,

8+, for iron base alloys which may contain carbon, e.g., steel.