US PATENT SUBCLASS 428 / 671
.~.~.~.~ Cu-base component alternative to Ag-, Au-, or Ni-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}
671.~.~.~.~ Cu-base component alternative to Ag-, Au-, or Ni-base component*

DEFINITION

Classification: 428/671

(under subclass 668) Subject matter in which a component may contain 40 percent or more of copper, or, alternatively to the copper, 40 or more of gold, nickel, or silver.

(1) Note. Copper must be one of the alternative metals for placement in this subclass.

(2) Note. Where the component contains some, but less that 40 percent copper, less than 40 percent total gold and silver, and less than 40 percent nickel, but where the total of these four metals is 40 percent or more, the patent is classified here.

(3) Note. Patents classified here are not cross-referenced to subclasses 672, 673, 674, or 680.

(4) Note. The classification and search rules for this subclass are the same as the "markush"-type subclass rules set out in the definition of subclass 643, (1) Note and (2) Note.

SEE OR SEARCH THIS CLASS, SUBCLASS:

656, to complete a search for a component having a base of copper, gold, nickel, or silver. SEE OR SEARCH CLASS

420, Alloys or Metallic Compositions,

507+, for a gold base alloy.