US PATENT SUBCLASS 318 / 667
.~.~.~.~ With a bridge in the feedback circuit

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

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
638  DF  .~ With particular "error-detecting" means {13}
652  DF  .~.~ With particular position measuring instruments {7}
663  DF  .~.~.~ Potentiometer systems including autotransformers and Wheatstone bridges {4}
667.~.~.~.~ With a bridge in the feedback circuit {1}
668  DF  .~.~.~.~.~> Recalibrating systems

DEFINITION

Classification: 318/667

(under subclass 663) Subject matter in which the feedback loop contains a bridge circuit which does not necessarily null out when the servo loop is balanced.

(1) Note. Excluded from this subclass are potentiometer systems in which the feedback potentiometer forms one half of a Wheatstone bridge. See definition of 663, supra.