US PATENT SUBCLASS 428 / 664
.~.~.~.~.~ Alternative to or next to each other*

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}
660  DF  .~.~.~ Refractory (Group IVB, VB, or VIB) metal-base component {3}
663  DF  .~.~.~.~ Group VIB metal-base component {3}
664.~.~.~.~.~ Alternative to or next to each other*

DEFINITION

Classification: 428/664

(under subclass 663) Subject matter in which a component having 40 percent or more of chromium, molybdenum or tungsten is adjacent a component having 40 percent or more of another of these metals, or in which the claims permit a component base to be selected from two or more of these metals, or a combination of any two or three of them.

(1) Note. Patents classified in this subclass are not cross-referenced to subclasses 663, 665 or 666.

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

656, and 661, to complete a search for Group VIB metal-base components.

SEE OR SEARCH CLASS 420, Alloys or Metallic Compositions,

428, for a chromium base alloy, subclasses 430+ for a tungsten base alloy and subclass 429 for a molybdenum base alloy.