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Class 326 - Electronic digital logic circuitry

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136 Subclasses


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Definition

BASIC SUBJECT MATTER OF CLASS

This is the generic class for electronic digital logic devices, circuitry and subcombinations thereof, wherein non-arithmetical operations are performed upon discrete electrical signals representing a value normally described by numerical digits.

COMBINATION WITH BASIC SUBJECT MATTER INCLUDED IN THIS CLASS:

Included in this class (326) is subject matter relating to:

1. digital circuits which perform basic logic functions such as AND, OR, NAND, NOR, EX-OR, or NOT;

2. decoder, inhibitor, multifunctional, or programmable logic circuits, etc., which perform basic logic functions and are used in an environment that is not related to any particular art provided for by other classes;

3. circuits that are used to control the performance of digital logic circuits, such as accelerating, switching, reliability, transmission integrity, etc.;

4. circuits that are used to control the functioning or to interface logical devices or circuitry, such as driving, clocking, or synchronizing.

Notes

(1) Note. An electronic device is a device in which conduction is principally by the movement of electrons through a vacuum, gas, semiconductor or superconductor. This definition excludes inductors, capacitors, resistors, and similar components which deal primarily with the conduction of large currents of electricity through metals. (2) Note. Logic is a science dealing with the basic principles and applications of truth tables, Boolean algebra, etc. and is also called symbolic logic which is a mathematical approach to the solution of complex situations by the use of symbols to define basic concepts. The three basic logic symbols are AND, OR, and NOT. When used in Boolean algebra, these symbols are somewhat analogous to addition and multiplication. (3) Note. Examples of non-arithmetical operations are selecting, searching, sorting, or matching. Half-adder circuits in this class accepting two binary inputs are also considered non-arithmetic. (4) Note. Discrete signals are discontinuous signals which can only assume a finite number of states. (5) Note. Numerical digits are symbols that represent a specific quantity or amount of units. (6) Note. The value described may include a value represented by a pulse repetition rate. (7) Note. A full adder circuit, which is a half adder circuit with look ahead carry (three binary inputs), is considered arithmetic and is classified elsewhere. See References to Other Classes, below, for an electric digital calculating computer.

Lines with other classes and within this class

COMBINATION WITH BASIC SUBJECT MATTER EXCLUDED FROM THIS CLASS:

The combination of the subject matter of this class and another art environment is generally classified with the art device where the environment is significant by virtue of the claimed relationship. Examples include: Logic devices combined with memory systems; Logic devices in arithmetical calculators; Logic circuits in signal discriminators using coincidence function.

See References to Other Classes for the above art areas and to complete the search for subject matter of Class 326.

DIGITAL LOGIC DEVICES EXCLUDED FROM THIS CLASS:

Some particular types of digital logic devices are not classified in this class (326), such as:

Fluidic logic devices

Saturated non-linear reactor logic circuits

Detailed flip-flops, per se, generally are classified elsewhere; however, a multifunctional or programmable logic having a flip-flop is found in this class (326) and redundant logic having a flip-flop is also found in this class (326). See Subclass References to the Current Class, below.

Pulse counters, pulse dividers, or shift registers are classified elsewhere.

Optical logic gates are excluded from this class.

Laser logic systems are excluded from this class.

Neuron circuits are excluded from this class.

See References to Other Classes for the above art areas and to complete the search for subject matter of Class 326.

 
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