US PATENT SUBCLASS 257 / 406
.~.~.~.~ Plural gate insulator layers

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}
405  DF  .~.~.~ With gate insulator containing specified permanent charge {1}
406.~.~.~.~ Plural gate insulator layers

DEFINITION

Classification: 257/406

Plural gate insulator layers:

(under subclass 405) Subject matter wherein the gate insulator is made up of a plurality of gate insulator layers.