US PATENT SUBCLASS 428 / 641
.~.~ Ge- or Si-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}
641.~.~ Ge- or Si-base component

DEFINITION

Classification: 428/641

(under subclass 615) Subject matter in which a component contains 40 percent or more of silicon, germanium, or both.

SEE OR SEARCH THIS CLASS, SUBCLASS:

620, for similar materials where the Si- or Ge-base component is described as an electrical semiconductor.

SEE OR SEARCH CLASS

136, Batteries: Thermoelectric and Photoelectric,

239, for thermoelectric devices of composition containing a Group IV element.