US PATENT SUBCLASS 428 / 681
.~.~.~.~ Fe-base component

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.~.~.~.~ Fe-base component {2}
682  DF  .~.~.~.~.~> Next to Fe-base component {1}
684  DF  .~.~.~.~.~> Containing 0.01-1.7% carbon (i.e., steel) {1}

DEFINITION

Classification: 428/681

(under subclass 668) Subject matter in which a component has 40 percent or more of iron.

(1) Note. A component designated merely as a "ferrous base metal" is classified in this subclass (681).

(2) Note. To complete a search for a Fe-base component, subclasses 656 and 678 must be searched, as well as the appropriate subclasses selected from subclasses 619, 644, 648, 653, 659, 667, 676+, and 679+.

(3) Note. The patents classified in this subclass (681) and subclasses 684 and 685 as originals are those claiming composite materials, wherein a component is defined as a Fe-base component and adjacent components are metals of unspecified composition.

SEE OR SEARCH CLASS

148, Metal Treatment, 206, 238 for processes of carburizing, nitriding, or both (i.e., carbonitriding, etc.) of solid metal, and subclasses 316-319 for the resulting stock.

420, Alloys or Metallic Compositions,

8+, for iron base alloys.