US PATENT SUBCLASS 455 / 328
.~.~.~.~.~ Hollow waveguide

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
313  DF  .~ Frequency modifying or conversion {4}
323  DF  .~.~ Particular frequency conversion structure or circuitry {5}
325  DF  .~.~.~ Including distributed electrical parameter structure {3}
326  DF  .~.~.~.~ With balanced mixer {2}
328.~.~.~.~.~ Hollow waveguide

DEFINITION

Classification: 455/328

Hollow waveguide:

(under subclass 326) Subject matter in which the distributed electrical parameter structure is a transmission line comprising a hollow conducting tube.