US PATENT SUBCLASS 315 / 5.44
.~.~.~.~.~ Feedback connection between the hollow devices

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

1  DF  CATHODE RAY TUBE CIRCUITS {11}
3  DF  .~ Combined cathode ray tube and circuit element structure {2}
4  DF  .~.~ Inductor or distributed parameter-type inductive structure {2}
5  DF  .~.~.~ Ray passes in or through a hollow distributed parameter device {15}
5.39  DF  .~.~.~.~ Plural hollow devices {6}
5.44.~.~.~.~.~ Feedback connection between the hollow devices {1}
5.45  DF  .~.~.~.~.~.~> Three hollow devices

DEFINITION

Classification: 315/5.44

(under subclass 5.39) Subject matter wherein an electrical connection exists between the interiors of the hollow devices to transmit electrical energy between the devices, but in a direction opposite to that which the ray transmits.

(1) Note. The feedback connection may be either regenerative, degenerative, or sufficient to produce oscillations. If the feedback connection is a ray, in addition to the ray normally passing through the devices, classification is in subclass 5.17 above.

(2) Note. If the claims recite even broadly a load or output fed by the cathode-ray tube circuit herein classified, the load or output being disclosed as external to the envelope of the cathode-ray tube, classification is in Class 327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses, or in Class 331, Oscillators, appropriate subclasses, depending whether the energy fed back is insufficient or sufficient respectively to sustain oscillation. However, a coupling probe or loop to abstract energy from the output device is not sufficient to preclude classification here (5.44), even though designated as an output or load.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.17, for devices with a feedback connection therebetween, the connection being by a ray in addition to the ray normally passing through the devices. See also (1) Note above.

SEE OR SEARCH CLASS 330, Amplifiers,

45+, for amplifiers having electron beam tubes coupled to cavity resonators, including those with feedback circuits.

331, Oscillators, appropriate subclasses for electrical oscillators utilizing positive feedback to generate oscillations. See also (2) Note above.