US PATENT SUBCLASS 455 / 307
.~.~ With specific filter structure

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
296  DF  .~ Noise or interference elimination {10}
307.~.~ With specific filter structure

DEFINITION

Classification: 455/307

With specific filter structure:

(under subclass 296) Subject matter which offers

comparatively little opposition to certain frequencies or direct current while blocking or attenuating other frequencies.