US PATENT SUBCLASS 257 / 191
.~ Having graded composition

Current as of: June, 1999
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257 /   HD   ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES)

183  DF  HETEROJUNCTION DEVICE {10}
191.~ Having graded composition

DEFINITION

Classification: 257/191

Having graded composition:

(under subclass 183) Subject matter wherein the chemical composition of the semiconductor forming the heterojunction varies continuously in a direction either perpendicular or parallel to the junction.