US PATENT SUBCLASS 324 / 76.29
.~.~.~.~ 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}
76.12  DF  .~ Analysis of complex waves {3}
76.19  DF  .~.~ Frequency spectrum analyzer {7}
77.11  DF  .~.~.~ Nonscanning {5}
76.29.~.~.~.~ With filtering {1}
76.31  DF  .~.~.~.~.~> Parallel filters {1}

DEFINITION

Classification: 324/76.29

With filtering:

(under subclass 77.11) 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:

76.44+, for filtering in frequency comparison for determination of the frequency of cyclic current or voltage.

76.68, for filtering in phase comparison for the determination of 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).