US PATENT SUBCLASS 257 / 581
.~.~.~.~ Thin film ballasting means (e.g., polysilicon resistor)

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

565  DF  BIPOLAR TRANSISTOR STRUCTURE {11}
578  DF  .~ With enlarged emitter area (e.g., power device) {4}
579  DF  .~.~ With separate emitter areas connected in parallel {1}
580  DF  .~.~.~ With current ballasting means (e.g., emitter ballasting resistors or base current ballasting means) {1}
581.~.~.~.~ Thin film ballasting means (e.g., polysilicon resistor)

DEFINITION

Classification: 257/581

Thin film ballasting means (e.g., polysilicon resistor):

(under subclass 580) Subject matter wherein the ballasting means comprises thin film resistor means (e.g., a thin film polysilicon resistor).