US PATENT SUBCLASS 257 / 404
.~.~.~.~ Non-uniform channel doping

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

213  DF  FIELD EFFECT DEVICE {6}
288  DF  .~ Having insulated electrode (e.g., MOSFET, MOS diode) {17}
402  DF  .~.~ With permanent threshold adjustment (e.g., depletion mode) {3}
403  DF  .~.~.~ With channel conductivity dopant same type as that of source and drain {1}
404.~.~.~.~ Non-uniform channel doping

DEFINITION

Classification: 257/404

Non-uniform channel doping:

(under subclass 403) Subject matter wherein the dopant

concentration varies along at least one dimension of the channel.