US PATENT SUBCLASS 333 / 175
.~.~ Resonant, discrete frequency selective type

Current as of: June, 1999
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333 /   HD   WAVE TRANSMISSION LINES AND NETWORKS

24 R  DF  COUPLING NETWORKS {15}
167  DF  .~ Frequency domain filters utilizing only lumped parameters {10}
175.~.~ Resonant, discrete frequency selective type {1}
176  DF  .~.~.~> Including specific frequency rejection means

DEFINITION

Classification: 333/175

Resonant, discrete frequency selective type:

(under subclass 167) Subject matter which include resonant series and/or parallel inductance and capacity networks which offer a low impedance path to energy of a particular frequency or of a plurality of separate discrete frequencies and/or offer a high impedance path to energy of a particular frequency or of a plurality of discrete frequencies.

(1) Note. This subclass includes filters under its definition in which means are incorporated for sharpening the tuning of the resonant circuits as by compensating for the resistance in such circuits.

(2) Note. The filters in this subclass are especially designed to pass only a single discrete frequency or a plurality of discrete frequencies but not a continuous band, or to eliminate one or more discrete frequencies from a band of frequencies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

197+, for similar filters utilizing electromechanical transducers.

SEE OR SEARCH CLASS

330, Amplifiers,

302+, for transistor amplifiers with frequency responsive coupling; subclasses 94 and 109 for amplifiers with frequency responsive feedback means; subclass 154 for cascaded amplifiers having a resonant means in an interstage coupling circuit; subclasses 157+, 185+, and 192+, particularly subclasses 167, 189, and 196 for coupling circuits with resonant circuit means. 331, Oscillators,

76, for oscillators, combined with an output coupling network including a harmonic selecting filter.

334, Tuners, appropriate subclasses for tuners adapted to be used in wave energy apparatus, also see the reference note to Class 334 in the search notes of

167,.