US PATENT SUBCLASS 334 / 18
.~ Band scanning or selector circuit


Current as of: June, 1999
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334 /   HD   TUNERS

17  DF  TUNER UNIT WITH ELECTROMAGNETIC OPERATOR {3}
18.~ Band scanning or selector circuit {2}
19  DF  .~.~> Solenoid or relay-operated tuner means
20  DF  .~.~> Motor-operated {4}


DEFINITION

Classification: 334/18

(under subclass 17) Subject matter in which the electromagnetic operator is provided with a control system and/or means which causes the operator to drive the variable tuning unit in such a manner as to scan a frequency or band of frequencies with the control system and/or means acting upon the electromagnetic operator or its associated circuit to stop the scanning of the tuner unit when the tuner is properly adjusted to receive a given signal or signals.

(1) Note. Subject matter found in this subclass and the indented subclasses usually consists of a tuning system with a driving means which causes the tuner to scan the frequency band and when a radio signal is tuned in, a control voltage is applied to the means to deenergize the driving means and the tuner is stopped on the frequency of the radio signal. Tuners where the operator is connected to and energized by a switch which represents a particular frequency, the operation of the switch causing the operator to drive the tuner to and stop on the selected frequency, is not classified in this subclass but in subclass 29 below.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

445+, for electromagnetic operator with control systems for automatically starting and/or stopping.