US PATENT SUBCLASS 333 / 181
.~.~ Smoothing type (e.g., direct current power supply filters or decoupling filters)

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}
181.~.~ Smoothing type (e.g., direct current power supply filters or decoupling filters) {2}
182  DF  .~.~.~> Feedthrough type {1}
184  DF  .~.~.~> Monolithic structure

DEFINITION

Classification: 333/181

Smoothing type (e.g., direct current power supply filters or decoupling filters):

(under subclass 167) Subject matter having shunt capacitance or series inductance, or both, usually designed to pass direct current and to reduce the effect of any undesired alternating or pulsating current superimposed on the direct current or to pass direct current and low frequency alternating current or pulsating current and to reduce the effect of an undesired higher frequency alternating or pulsating current.

(1) Note. Such filters usually have no resonant relationship between the inductance and capacitance over the

range of applied frequencies.

(2) Note. These filters are usually of the "brute force" type, utilizing an excess inductance and/or capacitance. They are generally low pass, being adapted to pass direct current and to reduce the effect of any undesired alternating current superimposed on the direct current.

(3) Note. Included are systems with a smoothing-type filter combined with a passive network means to regulate the current or voltage applied to or abstracted from the filter.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems. If the circuit which performs the smoothing action does so only by "bucking out" or balancing the undesired components, classification is in Class 323.

330, Amplifiers, 141, for amplifiers having smoothing circuits in the bias control path; subclass 142 for amplifiers including self-biasing circuits; and subclasses 199+ for amplifiers having significant power or bias supply means which may include significant details of smoothing filters.

363, Electric Power Conversion Systems,

39+, for conversion systems, (i.e., rectification or decertification) in combination with smoothing-type filters.