US PATENT SUBCLASS 428 / 627
.~.~.~ Boride, carbide or nitride 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}
621  DF  .~.~ With additional, spatially distinct nonmetal component {7}
627.~.~.~ Boride, carbide or nitride component

DEFINITION

Classification: 428/627

(under subclass 621) Subject matter in which the nonmetal component is a binary compound of boron, carbon, or nitrogen.

(1) Note. Stock-material* having a boride, carbide, or nitride surface layer is placed here unless it is specified that the treatment with the nonmetal element is insufficient to produce a continuous phase of the nonmetal.

(2) Note. See the main class definition of this class (428), section VI, C, 6, for the loci of other subject matter related to coating and coated products which may contain a boride, carbide, or nitride component*.

SEE OR SEARCH CLASS

75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,

236+, for a consolidated metal power composition containing a carbide, and subclass 244 for such composition containing boron or nitrogen.

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