US PATENT SUBCLASS 455 / 191.1
.~.~.~ With plurality of tuned circuits

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
150.1  DF  .~ Signal selection based on frequency (e.g., tuning) {13}
188.1  DF  .~.~ Band selection {4}
191.1.~.~.~ With plurality of tuned circuits {2}
191.2  DF  .~.~.~.~> Varactor tuned
191.3  DF  .~.~.~.~> With switching between stages

DEFINITION

Classification: 455/191.1

With plurality of tuned circuits:

(under subclass 188.1) Subject matter including two or more tuned circuits each tunable to a different frequency.

(1) Note. The separate tuned circuits need not consist of separate distinct physical elements, but any two or more may share one or more elements in common. As an example, a single inductance may be divided into sections with one or more sections being parallel connected with a capacitor whereby each of the sections when so connected constitutes a separate tuned circuit. The plurality of tuned circuits may be situated either in the input to or the output of a radio frequency amplifier.

SEE OR SEARCH THIS CLASS, SUBCLASS:

340, for receivers in general with tunable or adjustable coupling circuits between stages.

SEE OR SEARCH CLASS

334, Tuners, appropriate subclasses for band selecting tuners, per se.