US PATENT SUBCLASS 315 / 39.55
.~.~ Variable tuning

Current as of: June, 1999
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315 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS

32  DF  COMBINED LOAD DEVICE OR LOAD DEVICE TEMPERATURE MODIFYING MEANS AND ELECTRICAL CIRCUIT DEVICE STRUCTURE {19}
39.51  DF  .~ Distributed parameter resonator-type magnetron {10}
39.55.~.~ Variable tuning {3}
39.57  DF  .~.~.~> Electron emission type
39.59  DF  .~.~.~> Thermal or magnetic actuator
39.61  DF  .~.~.~> Movable tuning element (e.g., slug)

DEFINITION

Classification: 315/39.55

(under subclass 39.51) Devices which are provided with means to change the tuning or the impedance of the distributed impedance structure of the discharge device.

(1) Note. The variable tuning means may be provided for maintaining the impedance or tuning of the device constant (e.g., such as compensating for changes caused by temperature conditions in the impedance structure) or it may be for the purpose of varying the impedance of the device.

(2) Note. This subclass does not include structure such as strapping which is utilized to cause all of the distributed impedance structures or parts to have a common impedance value such as magnetrons having a plurality of cavity resonators and straps between selected anode segments so that all of the resonators operate at the same frequency. For such excluded subject matter, see subclass 39.69, below.

(3) Note. The means for tuning or varying the impedance of the distributed impedance structure may be means for varying the geometrical configuration of the distributed impedance structure or means for creating or changing the space charge in the distributed impedance structure as by the use of an electric space discharge to project electrons into or adjacent to a resonant space or by the use of a movable tuning element. Where the means for changing the tuning or impedance includes an input or output coupling means, the search should be in subclass 39.53.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.13, for a distributed parameter resonator type magnetron, with a cathode-ray passing through or in the resonator of the magnetron for tuning purposes.

39.53, see (3) Note. 39.71, for devices under subclass 39.51 which are provided

with a magnetic field generating means and means for varying the strength or orientation of the magnetic field.

SEE OR SEARCH CLASS

331, Oscillators,

5, for magnetron oscillators wherein the generator frequency is controlled by an automatic frequency stabilization control loop, and subclass 90 for magnetron type oscillators with frequency adjusting means.

333, Wave Transmission Lines and Networks,

235, for resonant structures of the distributed parameter type which are provided with tuning means, see subclasses 227+ for the cavity or waveguide type, and subclasses 236+ for long lines with means for varying the impedance of the line, see subclasses 239+ for waveguides and subclasses 243+ for coaxial cables.

334, Tuners, appropriate subclasses for variable tuners, per se, and especially

41+, for resonant line tuners of the distributed parameter type.

336, Inductor Devices, appropriate subclasses for variable inductors, per se.