US PATENT SUBCLASS 342 / 350
DIRECTIVE

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

350DIRECTIVE {10}
351  DF  .~> Including a radiometer
352  DF  .~> Including a satellite {6}
359  DF  .~> Including antenna orientation
360  DF  .~> Including antenna pattern plotting
361  DF  .~> Including polarized signal communication transmitter or receiver {3}
367  DF  .~> Including directive communication system
368  DF  .~> Including a steerable array {8}
378  DF  .~> Utilizing correlation techniques {3}
385  DF  .~> Beacon or receiver {2}
450  DF  .~> Position indicating (e.g., triangulation) {11}

DEFINITION

Classification: 342/350

DIRECTIVE:

(under the class definition) Devices and processes for sending or receiving radio wave energy which is characterized by some quality that varies according to the relative direction or position of the sender or receiver.

(1) Note. The received wave is not the reflected or returned transmitted wave.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1, through 205+, for similar systems which involve "echo" or reflected wave reception (radar systems) including directive systems of the reflected wave type.

SEE OR SEARCH CLASS

340, Communications: Electrical,

22+, for traffic and vehicle direction or position indicators using electrical communication apparatus.

343, Communications: Radio Wave Antennas, 700+, for directive antenna and antenna array structures.

370, Multiplex Communications, appropriate subclasses for nondirective type systems or devices involving the transmission or reception of multiplexed signals, per se.

375, Pulse or Digital Communications, appropriate subclasses for nondirective type systems or devices involving the transmission or reception of pulse or digital signals, per se.

434, Education and Demonstration,

1+, and 29+ for devices for instructing or training in the characteristics or operation of navigational apparatus including radio beacons, blind landing systems, radio

direction finders, etc.

455, Telecommunications, appropriate subclasses for nondirective signal transmission or reception systems, per se.

701, Data Processing: Vehicles, Navigation, and Relative Location,

200+, for computer navigation systems using electrical computers or data processors.