US PATENT SUBCLASS 324 / 76.31
.~.~.~.~.~ Parallel filters

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

76.11  DF  MEASURING, TESTING, OR SENSING ELECTRICITY, PER SE {46}
76.12  DF  .~ Analysis of complex waves {3}
76.19  DF  .~.~ Frequency spectrum analyzer {7}
77.11  DF  .~.~.~ Nonscanning {5}
76.29  DF  .~.~.~.~ With filtering {1}
76.31.~.~.~.~.~ Parallel filters {1}
76.32  DF  .~.~.~.~.~.~> With space discharge device

DEFINITION

Classification: 324/76.31

Parallel filters:

(under subclass 76.29) Subject matter including parallel connected network of resistors, inductors, or capacitors which offers comparatively little opposition to certain frequencies, while blocking or attenuating other frequencies.

SEE OR SEARCH THIS CLASS, SUBCLASS:

76.28, for digital filters in frequency spectrum analysis.

76.44, for filtering in frequency comparison used to determine the frequency of cyclic current or voltage.

76.68, for filtering in phase comparison used to determine the frequency of cyclic current or voltage.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks, appropriate subclasses for filters and filtering in wave transmission lines and networks. 702, Data Processing: Measuring, Calibrating, or Testing,

17, for filtering or noise removal in a seismic prospecting system, subclasses 190+ for measured signal extraction or separation (e.g., filtering).