US PATENT SUBCLASS 428 / 656
.~.~.~ Alternative base metals from diverse categories*

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}
656.~.~.~ Alternative base metals from diverse categories*

DEFINITION

Classification: 428/656

(under subclass 655) Subject matter in which a component of a composite comprises 40 percent or more of a metal which is permitted by the claims to be selected from more than one of the following diverse categories: Category A: Group IIB metals Category B: Group IIIB metals Category C: Refractory (Groups IVB, VB, VIB metals) Category D: Group VIIB metals Category E: Group VIII or IB metals.

(1) Note. Where the selection of the base transition metal is restricted to one of the above categories, the patent is not placed here.

(2) Note. Where the composite has a component made of at least three metals, none of which is present as more than 40 percent by weight of the component, and no combination of metals provided for in a single category above is present as more than 40 percent by weight, but in which the total of transition metals is 40 percent or more, by weight, it is classified in this subclass (656).

(3) Note. This subclass follows the classification and search rules for "Markush"- type subclasses set forth in the definition of subclass 643, (1) Note and (2) Note.

(4) Note. When a patent is proper for classification in this subclass, such classification provides fully for all interfaces between transition-metal-base components; however, it may be desirable, when a particular metal, alloy, or combination of components, specifically provided for in a

subclass below, is emphasized, to place a copy of the patent in such subclass. Exemplary of such emphasis is the restriction of a nonalternative component to a specific alloy or grain structure, a claim to only one preferred species of the alternative component, etc.

SEE OR SEARCH CLASS 427, Coating Processes,

305, for treatment of a metal base preparatory to coating with nickel, copper, cobalt or chromium.