Current as of: June, 1999
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1.1  DF  .~> Nonreciprocal gyromagnetic type (e.g., circulators)
2  DF  .~> With automatic control {1}
4  DF  .~> With balanced circuits {1}
100  DF  .~> Having branched circuits {6}


Classification: 333/1

(under the class definition) Systems comprising (a) two or more wave transmission lines or networks, each line or network being operable to separately propagate wave energy or (b) means for effecting an interchange of wave energy from one transmission line to two or more transmission lines or vice versa, or having a coupling network for effecting an interchange of wave energy from a single input to plural outputs or vice versa, together with means for controlling or facilitating the interchange of energy.

(1) Note. The term "network" as used above denotes any of the systems defined in the Class Definition, subsection A.

(2) Note. Included in (a) above are systems having two distinct transmission lines, each line being operable to transmit wave energy electrically distinct from that propagated by another of the transmission lines, and also

lines which are distinct but not necessarily simultaneously usable to transmit electrical wave energy (e.g. one line may be used to substitute for another as in subclass 3). The two or more transmission lines may have a common conductor, see especially subclasses 4+ where a balanced circuit is involved.

(3) Note. Included are lines which transmit energy from a first point to a second spaced point and provided with means to transmit a portion of the energy to a second line (e.g. a tapped line).

(4) Note. This and the indented subclasses do not provide for systems where a signal is divided among two transmission lines or networks and then recombined on a single line or to provide a single output. Such systems and networks are found in subclasses 12 et seq. If the system claimed does not extend to the recombining part of the line or network, the patent is classified in this or the indented subclasses.

(5) Note. A system having a single transmission line and pilot line to sense only ambient conditions (temperature, humidity) is not classified as a plural channel system. See subclass 15 for this subject matter. A system with a single communication transmission line and also a pilot line which is a long line within the class definition and which transmits wave energy is classified in this or indented subclasses. SEE OR SEARCH THIS CLASS, SUBCLASS:

15, see (5) Note above.


174, Electricity: Conductors and Insulators, appropriate subclasses for electrical conductor structure adapted for use in plural channel systems other than loaded lines or transmission lines defined as having long line characteristics.

178, Telegraphy, appropriate subclasses for plural channel systems involving telegraphy, note

45, for plural channel systems using a loaded line.

307, Electrical Transmission or Interconnection Systems, particularly

11+, 43+, 113+, and 147+ for miscellaneous electrical distribution systems involving plural channels.

330, Amplifiers,

295, for plural channel transistor amplifiers, subclass 69 for sum and difference amplifiers, subclasses 73 and 74 for series arranged amplifiers with plural outputs and plural

inputs, respectively, subclass 84 for plural channel amplifiers having feedback, subclasses 124+ for plural channel amplifiers generally, subclasses 147 and 148 for amplifiers having plural inputs and plural outputs, respectively. See especially, subclasses 54 and 286+ for "distributed amplifiers".

334, Tuners, appropriate subclasses for tuners, per se. 439, Electrical Connectors, particularly

775+, 865+, 869+, 874+, 877+, 883, and 884+ for various types of electrical connections and terminals.

340, Communications: Electrical, appropriate subclasses for miscellaneous electrical communications, including signalling systems, involving plural channels. Note particularly

870.11+, and 870.41, and 870.27 for continuously variable indication communication systems involving plural transmitters, plural receivers, and plural circuits respectively.

343, Communications: Radio Wave, particularly

771, for plural slot type antennas with wave guide coupling; subclasses 814 and 816 for plural balanced doublet type antennas with a coupling network; subclass 852 for antennas with a plural path coupling network with impedance matching; subclasses 853+ for plural antennas with a coupling network; and subclass 858 for antennas coupled to plural leadins.

370, Multiplex Communications,

200, for a phantom circuit, and subclass 308 for a resonant transfer technique used in the multiplex system.

379, Telephonic Communications, appropriate subclasses for plural channel systems involving telephony, see

338+, for circuits having a two-way repeater (amplifiers) therein.

455, Telecommunications,

39+, for plural channel modulated carrier wave systems; subclasses 91+ for transmitters; subclasses 130+ for plural channel systems in radio receivers; see particularly subclasses 132+ for plural separate receivers; subclasses 3.1+ for distribution systems; and subclasses 272+ for plural separate collecting means.