US PATENT SUBCLASS 455 / 283
.~.~.~ Undesired signal or noise control (e.g., antistatic)

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

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}
283.~.~.~ Undesired signal or noise control (e.g., antistatic) {5}
284  DF  .~.~.~.~> Balancing or cancelling
285  DF  .~.~.~.~> With image frequency suppression
286  DF  .~.~.~.~> Wave filter, coil, or wave trap
287  DF  .~.~.~.~> Shunt or bypass
288  DF  .~.~.~.~> Particular composition (e.g., of cell or element)

DEFINITION

Classification: 455/283

Undesired signal or noise control (e.g., antistatic):

(under subclass 280) Subject matter in which the coupling means acts to reduce signals or noise from the frequency spectrum of the desired signal.

(1) Note. For purposes of classification in this and subsequent subclasses any undesired signal or electrical disturbance within the useful frequency band will be considered to be noise and any unwanted and random noise caused by atmospheric conditions or electric or electrostatic discharges originating from other sources external of and influencing the collector will be considered as static. For systems comprising means, within the receiver circuit, for prevention, reduction, or elimination of noise and/or other interference search will be in this class (455), subclasses 296+ below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

278.1, for plural antennas for a single receiver with noise or interference suppressing means.

296, for similar systems wherein the collector is not claimed. See (1) Note above.

SEE OR SEARCH CLASS

174, Electricity: Conductors and Insulators, 32+, for anti-inductive structures.

307, Electrical Transmission or Interconnection Systems,

89+, for anti-induction or coupling means for prevention of inductive coupling to other circuits; and subclass 93 for surge, transient, or parasitic current suppression means.

333, Wave Transmission Lines and Networks,

12, for wave transmission line inductive or radiation interference reduction systems.

343, Communications: Radio Wave Antennas, appropriate subclasses for antenna structure combined with impedance means in the leadin which may serve as interference attenuation means, particularly

851, for antenna combined with coupling network having radiation suppressing means.