US PATENT SUBCLASS 455 / 7
CARRIER WAVE REPEATER OR RELAY SYSTEM (I.E., RETRANSMISSION OF SAME INFORMATION)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


455 /   HD   TELECOMMUNICATIONS

7CARRIER WAVE REPEATER OR RELAY SYSTEM (I.E., RETRANSMISSION OF SAME INFORMATION) {12}
8  DF  .~> Failure compensation (e.g., spare channel)
9  DF  .~> Monitoring {1}
11.1  DF  .~> Portable or mobile repeater {1}
14  DF  .~> With transmission line
15  DF  .~> Two separate way transmission {1}
17  DF  .~> Plural modulated carriers
18  DF  .~> With delay or recording
19  DF  .~> Common antenna
20  DF  .~> With frequency conversion {2}
23  DF  .~> Frequency or phase modulation
24  DF  .~> Transmitter/receiver feedback compensation
25  DF  .~> Directive antenna

DEFINITION

Classification: 455/7

CARRIER WAVE REPEATER OR REPLAY SYSTEM (I.E., RETRANSMISSION OF SAME INFORMATION):

(under the class definition) Subject matter comprising means whereby a radiant energy signal wave is received and reradiated at the same or different carrier frequency and usually at a higher energy level and/or in a desired

direction.

(1) Note. Where the transmitted signal has a different characteristic than the received signal or involves the addition or subtraction of information classification is not in this subclass, but in Class 343 (see notes under subclass 6.5 in the class definition of Class 343). However, if the transmitted signal is on a different carrier frequency from the received signal merely to avoid interference classification is in this subclass.

SEE OR SEARCH CLASS

178, Telegraphy,

70+, for repeaters specific to telegraphy.

330, Amplifiers, for amplifiers systems in general, particularly

10, for modulator-demodulator type amplifiers for amplifying direct current or slowly varying alternating current signals. 332, Modulators, particularly

183+, for modulation converters for converting one modulated wave to a differently modulated wave (e.g., pulse modulation to frequency modulation or frequency modulation to amplitude modulation); subclass 108 for plural stage modulation systems wherein each stage is of the same or diverse type of modulation, the last stage being of the pulse modulation type; subclasses 119+ or 145, for plural stage modulation systems wherein the last stage is of the phase or frequency modulation type; and subclasses 151+ for plural stage modulation systems wherein the last stage is of the amplitude modulation type.

333, Wave Transmission Lines and Networks,

117, for hybrid-type networks.

340, Communications: Electrical,

291, for signal box repeaters which repeat, for example, signals received at a central station to a plurality of fire houses.

343, Communications: Radio Wave Antennas,

5+, for systems and apparatus which include a receiver-transmitter station designed for control by a wave transmitted from a first transmission station and designed to transmit a signal which is different from the received signal, i.e., adds additional information, the system including means to receive the signal transmitted by the receiver transmitter station. Where the signal which is

transmitted by the receiver-transmitter is of the same character as the received signal, even though a time-delay is interposed between the time of reception and the time of transmission, the patent is classified in this subclass.

370, Multiplex Communications,

274, 279, 293, 315+, and 492+ for repeaters using multiplex frequency channels.