US PATENT SUBCLASS 712 / 221
.~ Arithmetic operation instruction processing

Current as of: June, 1999
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712 /   HD   ELECTRICAL COMPUTERS AND DIGITAL PROCESSING SYSTEMS: PROCESSING ARCHITECTURES AND INSTURCTION PROCESSING (E.G., PROCESSORS)

220  DF  PROCESSING CONTROL {12}
221.~ Arithmetic operation instruction processing {1}
222  DF  .~.~> Floating point or vector

DEFINITION

Classification: 712/221

Arithmetic operation instruction processing:

(under subclass 220) Subject matter for control of execution or processing of instruction data peculiar to arithmetic operation (e.g., add, subtract, multiply, etc.).

(1) Note. This subclass is directed to control of execution or processing of an instruction peculiar to arithmetic operation. Arithmetic functional units, that is, machines which carry out arithmetical calculations, per se, are classified elsewhere. See SEE OR SEARCH CLASS below.

SEE OR SEARCH CLASS

708, Electrical Computers: Arithmetic Processing And Calculating,

100+, for electrical calculators; subclasses 200+ for specialized functions performed by an electrical digital calculating computer such as function generation and filtering; subclasses 400+ for transforms (e.g., Fourier); subclasses 440+ for trigonometric functions; and subclasses 490+ for arithmetic operations, per se.