US PATENT SUBCLASS 455 / 292
.~.~.~ Transformer or other passive inductance

Current as of: June, 1999
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130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
269  DF  .~ With wave collector (e.g., antenna) {4}
280  DF  .~.~ With coupling to a stage of the receiver {7}
292.~.~.~ Transformer or other passive inductance

DEFINITION

Classification: 455/292

Transformer or other passive inductance:

(under subclass 280) Subject matter wherein the coupling means includes at least the primary winding of a transformer or other inductive means.

(1) Note. For purposes of Classification in this subclass the primary winding of an input transformer, the secondary winding of which, along with a capacitor or other tuning means constitutes the wave selecting or tuning means in the input of a receiver, will be considered to be in the coupling circuit and will be found in subclasses 289 and 290.

SEE OR SEARCH THIS CLASS, SUBCLASS:

284, 285, 286, and 287, (note also) where inductances may be used in noise reducing coupling circuits.

289, where variometers and variable inductances are classified.

290, where tuned circuits using inductances are classified.

SEE OR SEARCH CLASS

343, Communications: Radio Wave Antennas, 745+, for antenna structure combined with variable reactance for tuning the antenna; subclasses 749+ for antenna structure combined with lumped reactance for leading the antenna; and subclasses 850+ for antenna structure combined with impedance means in the leadin.