US PATENT SUBCLASS 455 / 325
.~.~.~ Including distributed electrical parameter structure

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
313  DF  .~ Frequency modifying or conversion {4}
323  DF  .~.~ Particular frequency conversion structure or circuitry {5}
325.~.~.~ Including distributed electrical parameter structure {3}
326  DF  .~.~.~.~> With balanced mixer {2}
329  DF  .~.~.~.~> Electron beam tube
330  DF  .~.~.~.~> With nonlinear impedance (e.g., diode)

DEFINITION

Classification: 455/325

Including distributed electrical parameter structure:

(under subclass 323) Systems comprising frequency conversion means including significant structural elements of such dimensions that their distributed constants (e.g., inductance, capacitance, resistance, or conductance) must be taken into account.

(1) Note. The distributed inductance or capacity may be either in the conversion device or associated circuitry.

(2) Note. The subject matter found here generally consists of systems where the combination of a detecting element and structure having distributed electrical parameters and which system is restricted by disclosure or claims to mixers or converters. Where the combination is claimed generically with general detection use suggested in the specification, or with both mixer and detector use suggested in the specification, classification is in Class 329, subclasses 160+ or other appropriate subclasses.

SEE OR SEARCH CLASS

329, Demodulators,

322, and 354 for distributed parameter structure in a frequency or amplitude demodulator, respectively.

330, Amplifiers,

43, for travelling wave tube amplifiers; subclass 44 for electron beam tube amplifiers; subclass 47 for magnetron amplifiers; and subclass 49 for electron vacuum tube amplifiers with distributed electrical parameter elements. 331, Oscillators, appropriate subclasses for oscillators with distributed parameter resonator, particularly

42, for beat frequency oscillators with cavity mixer.

332, Modulators,

129+, for distributed parameter structure in a frequency modulator and subclasses 163+ for distributed parameter structure in an amplitude modulator.

333, Wave Transmission Lines and Networks appropriate subclasses for passive wave transmission networks of the distributed parameter type.