US PATENT SUBCLASS 343 / 866
.~ Loop type

Current as of: June, 1999
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343 /   HD   COMMUNICATIONS: RADIO WAVE ANTENNAS

700 R  DF  ANTENNAS {58}
866.~ Loop type {5}
867  DF  .~.~> Plural; plural or tapped coils
868  DF  .~.~> Adjustable configuration, area or coil length
869  DF  .~.~> With rotatable support
870  DF  .~.~> With connector or terminals
871  DF  .~.~> With collapsible or foldable frame

DEFINITION

Classification: 343/866

(under subclass 700) Subject matter including a coil of one or more turns adapted to be connected at its ends to a pair of lead-in terminals, and further adapted to establish in or receive from space radio wave energy together with a frame for establishing a particular shape or pattern of shapes for the coil, or the coil has sufficient rigidity to establish a shape without the frame.

(1) Note. The loops in this and the indented subclasses form with the source or load circuitry connected thereto a series circuit, as opposed to the antennas of subclass 895 in which a single terminal feeds to or from the antennas to leave an end electrically free.

(2) Note. As between loop antennas and the inductor devices of Class 336, the claiming of an antenna by name only or the recitation of structure peculiar to antennas would classify the patents in this subclasses (866+). If the disclosure is a loop antenna, but the claims merely recite an inductor device, classification is in Class 336.

(3) Note. Loop antennas wherein the coil has a particular shape or configuration are classified in this subclass (866).

SEE OR SEARCH THIS CLASS, SUBCLASS:

726, and 728, for plural separate diverse type antennas including a loop antenna.

732, for loop antennas having energy absorbing means remote from the feed line coupling. 741+, for high frequency type loops.

748, for loop type antennas with variable reactance for tuning.

764, for loop antennas having means for scanning, sweeping or orienting the antennas in rotary or oscillatory motion.

767+, for slot type antennas.

788, for loop antennas including magnetic material.

803+, for folded dipoles.

842, for loop type antennas with an electrical shield.

855, for plural loop antennas with a coupling network or impedance in the leadin.

895, for spiral or helical type antennas. See also (1) Note above.

SEE OR SEARCH CLASS

246, Railway Switches and Signals, 8, for inductive type railway signaling.

267, Spring Devices, particularly

69, for coil spring devices.

336, Inductor Devices, see (2) Note, above.

342, Communications: Directive Radio Wave System and Devices (e.g., Radar, Radio Navigation),

1, 205 for directive radio wave energy system which may include a loop antenna as an element thereof.