US PATENT SUBCLASS 324 / 76.68
.~.~.~ With filtering

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}
76.39  DF  .~ Frequency of cyclic current or voltage (e.g., cyclic counting etc.) {6}
76.52  DF  .~.~ By phase comparison {10}
76.68.~.~.~ With filtering

DEFINITION

Classification: 324/76.68

With filtering:

(under subclass 76.52) Subject matter including a 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.

76.29+, for filtering in frequency spectrum analyzer.

76.31, for parallel filters in frequency spectrum analysis.

76.44, for filtering in frequency 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).