US PATENT SUBCLASS 326 / 124
.~ Bipolar transistor (e.g., RTL, DCTL, etc.)

Current as of: June, 1999
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326 /   HD   ELECTRONIC DIGITAL LOGIC CIRCUITRY

104  DF  FUNCTION OF AND, OR, NAND, NOR, or NOT {7}
124.~ Bipolar transistor (e.g., RTL, DCTL, etc.) {5}
125  DF  .~.~> Wired logic or open collector logic (e.g., wired-OR, wired-AND, dotted logic, etc.)
126  DF  .~.~> Emitter-coupled or emitter-follower logic {1}
128  DF  .~.~> Transistor-transistor logic (TTL) {1}
130  DF  .~.~> Diode-transistor logic (DTL) {1}
132  DF  .~.~> With negative resistance device (e.g., tunnel diode, thyristor, etc.)

DEFINITION

Classification: 326/124

Bipolar transistor (e.g., RTL, DCTL, etc.):

(under subclass 104) Subject matter including a semiconductor device of the type having at least three electrodes (emitter, base, and collector), two potential barriers, and wherein a controlled current flow comprises both majority and minority carriers (i.e., holes and electrons).

(1) Note. Among the logic function configurations found in this subclass are (a) resistor-transistor logic (RTL) that has a resistor as an input component coupled to the base of a bipolar transistor; and (b) direct-coupled transistor logic (DCTL) which is a NOR gate type of bipolar logic in which the output of one gate is coupled directly to the input of the succeeding gate.