US PATENT SUBCLASS 438 / 37
.~ Graded composition

Current as of: June, 1999
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438 /   HD   SEMICONDUCTOR DEVICE MANUFACTURING: PROCESS

22  DF  MAKING DEVICE OR CIRCUIT EMISSIVE OF NONELECTRICAL SIGNAL {12}
37.~ Graded composition

DEFINITION

Classification: 438/37

Graded composition:

(under subclass 22) Process wherein the chemical composition of a semiconductor region of the substrate varies with location within the semiconductive region.