US PATENT SUBCLASS 318 / 600
.~ Digital or numerical systems

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
600.~ Digital or numerical systems {3}
601  DF  .~.~> Digital comparison {1}
603  DF  .~.~> Pulse-counting systems
604  DF  .~.~> Analogue comparison {1}

DEFINITION

Classification: 318/600

(under subclass 560) Subject matter in which the command signal is digital or numerical. A digital or numerical command is one which is composed of one or more discrete symbols which may form a code. These symbols may take the form of any of the following examples: (1) The presence or absence of a discrete value of electrical voltage or current; (2) The presence or absence of a perforated hole in a tape or card; (3) The presence or absence of a discrete mechanical movement; (4) The making or breaking of an electrical switch. The above examples are not exclusive but merely representative.

SEE OR SEARCH THIS CLASS, SUBCLASS:

569+, for programmed controlled digital servo systems.

594, for digital fine and coarse systems.

SEE OR SEARCH CLASS

364, Electrical Computers and Data Processing Systems, appropriate subclass; see the search class note in the class definition of this class (318).