US PATENT SUBCLASS 257 / 643
.~.~.~.~ Polyimide or polyamide

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}
642  DF  .~.~.~ At least one layer of organic material {1}
643.~.~.~.~ Polyimide or polyamide

DEFINITION

Classification: 257/643

Polyimide or polyamide:

(under subclass 642) Subject matter wherein the at least one organic insulating layer comprises polyamide (i.e., a polymeric compound) resulting from replacement of an atom of hydrogen in an organic amine by an organic univalent acid radical, or polyimide, i.e., a polymeric compound resulting from replacement of both atoms of hydrogen in an organic amine by organic univalent acid radicals or by an organic divalent acid radical.

(1) Note. Polyamides are copolymers (polymers formed from at least two different starting organic materials) which have a linkage, as illustrated below, between the starting materials, where R is typically hydrogen and Q1 and Q2 are the organic residues of the starting monomers.

(2) Note. Linkage between the starting materials, illustrated below.