US PATENT SUBCLASS 257 / 637
.~.~.~ Three or more insulating layers

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

629  DF  WITH MEANS TO CONTROL SURFACE EFFECTS {4}
632  DF  .~ Insulating coating {8}
635  DF  .~.~ Multiple layers {8}
637.~.~.~ Three or more insulating layers

DEFINITION

Classification: 257/637

Three or more insulating layers:

(under subclass 635) Subject matter wherein there are three or more insulating coatings on the surface of the semiconductor body.