US PATENT SUBCLASS 455 / 39
TRANSMITTER AND RECEIVER AT SEPARATE STATIONS

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

39TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14}
40  DF  .~> Earth or water medium
41  DF  .~> Near field (e.g., inductive or capacitive coupling)
42  DF  .~> Frequency or phase modulation {3}
46  DF  .~> Suppressed carrier wave system
47  DF  .~> Single or vestigial sideband system
48  DF  .~> Inverted sideband
500  DF  .~> Plural transmitters or receivers (i.e., more than two stations) {4}
59  DF  .~> Single message via plural carrier wave transmission {1}
61  DF  .~> Single message via plural modulation of single carrier
62  DF  .~> Optimum frequency selection
63  DF  .~> Distortion, noise, or other interference prevention, reduction, or compensation {2}
66  DF  .~> With diverse art device
67.1  DF  .~> With measuring, testing, or monitoring of system or part {6}
68  DF  .~> With control signal {2}

DEFINITION

Classification: 455/39

TRANSMITTER AND RECEIVER AT SEPARATE STATIONS:

(under the class definition) Subject matter including at least one transmitting device which converts analog information signals (e.g., audio) into modulated carrier wave signals, a carrier wave transmission medium, and at least one receiving device whereby the information or modulating signal transmitted will be derived from the received modulated carrier wave signals.

(1) Note. A system, in order to be classified in this subclass and its indents must include a means whereby the information transmitted is transmitted by means of a sinusoidal electromagnetic carrier wave. Systems wherein the intelligence to be conveyed is transmitted by dot and dash (i.e., presence or absence of a unidirectional or direct current wave) are found elsewhere. Systems wherein the intelligence conveyed is pulse or digital information are found elsewhere. Systems wherein the intelligence to be conveyed by a varying current without a carrier wave are found elsewhere. Systems which are properly classifiable, as a result of some significantly claimed art limitations, in another class will not be classified here.

(2) Note. The subject matter classifiable here will generally comprise both the means for origination and modulating a carrier wave according to the information, desired to be transmitted, and a means for receiving the modulated carrier wave and deriving the desired information. However, where the claimed subject matter includes claims reciting the specific details of a transmitter or receiver or transceiver and broadly include another receiver, transceiver, or transmitter of different type by name only, the patent will be classified here and cross-reference down to the appropriate subclass below which contains the particular transmitter, transceiver, or receiver claimed.

(3) Note. The systems in this and the indented subclasses comprises at least one transmitter and receiver device which devices are located at an appreciable distance one from the other. However, patents in which the claimed subject matter includes transmitter-receiver means at a single station (transceiver) are also to be found here providing sufficient structure is recited whereby the transmitter-receiver means cooperates with and influence or is influenced by a further receiver or transmitter at a distance; providing, that the claimed subject matter does not include a structure limiting the system to use of radiant energy as defined in the definition of Class 343 or to use in some other art class device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7+, for transmitter-receiver repeater systems.

73+, for complete stations wherein the transmitter and receiver are at the same point. 91+, for transmitter, per se.

130+, for receivers, per se.

600+, for light wave communications.

SEE OR SEARCH CLASS

178, Telegraphy,

2+, for various telegraph systems which are limited to the transmission and reception of telegraph signals; subclasses 24+ for teleprinting systems; subclasses 45+ for loaded carrier wave transmission lines; and subclass 118 for miscellaneous telegraph receivers.

244, Aeronautics, particularly

175+, for systems for automatically controlling aircraft by means of electrical apparatus which may utilize modulated carrier waves for control.

246, Railway Switches and Signals, particularly

7+, and 28+ for carrier wave systems employed in railway signalling.

307, Electrical Transmission or Interconnection Systems,

117, for switching systems controlled by radiant energy; and subclass 129 for frequency responsive switching space discharge device or lamp systems. 315, Electric Lamp and Discharge Devices: Systems,

149+, for radiant energy controlled space discharge device or lamp systems.

318, Electricity: Motive Power Systems,

16, for electric motor systems where the motor is controlled or supplied by space transmitted electromagnetic or electrostatic energy (including radio energy).

324, Electricity: Measuring and Testing, appropriate subclasses for systems for measuring or utilizing carrier waves.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for miscellaneous circuits which may constitute elements of a

system such as those classifiable in this class.

333, Wave Transmission Lines and Networks, appropriate subclasses for passive carrier wave transmission lines which may include passive network elements, attenuators or resonators which may have utility in the carrier wave systems of this class.

340, Communications: Electrical, appropriate subclasses for electrical signalling systems, especially

825.71+, for selective signalling systems, utilizing carrier waves; subclasses 870.01+ for telemetering systems; subclass 539 for systems automatically responsive to a condition and wherein the signal is transmitted via radio levels; and subclass 286 for miscellaneous signalling systems consisting of transmitters and receivers; subclass 347 for code converters wherein a transmitter may receive its information in the form of a first code and transmit the information in the form of a dissimilar code; and subclasses 345+ for code transmitters.

346, Recorders,

37, for systems wherein a recorder is operated in response to the tuning of a radio receiver or receivers, e.g., community radio listening survey. 369, Dynamic Information Storage or Retrieval,

6+, for combined radio and phonograph systems.

370, Multiplex Communications, for analog carrier wave communication systems which have multiplexing.

375, Pulse or Digital Communications, for systems conveying or digital pulse information which may use modulated carrier waves.

380, Cryptography, for cryptos:graphic communications.

411, Expanded Threaded, Driven Headed, Tool-Deformed or Lock Threaded Fastener,

50+, for code converters wherein a transmitter may receive its information in the form of a first code and transmit the information in the form of a dissimilar code; and subclasses 20+ and 173+ for code transmitters.