US PATENT SUBCLASS 315 / 1
CATHODE RAY TUBE CIRCUITS

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

1CATHODE RAY TUBE CIRCUITS {11}
3  DF  .~> Combined cathode ray tube and circuit element structure {2}
8  DF  .~> Compensating for stray deflecting fields
8.51  DF  .~> Pulse storing {1}
9  DF  .~> Plural cathode-ray tubes in the circuit
10  DF  .~> With radiant energy sensitive control means {1}
12.1  DF  .~> With secondary emission stage in the cathode-ray tube
13.1  DF  .~> Plural ray-type tube {1}
14  DF  .~> Plural concentrating, accelerating, and/or de-accelerating stages {2}
364  DF  .~> Cathode-ray deflections circuits {16}
30  DF  .~> Ray modulation
411  DF  .~> Power supply from deflection circuit source

DEFINITION

Classification: 315/1

(under the class definition) Subject matter for supplying electric current and/or potential to cathode-ray tubes, and/or cathode-ray tubes combined with a circuit element which is structurally combined with the cathode-ray tube so as to form a unitary device.

(1) Note. Cathode-ray tubes are defined for the purpose of classification in this subclass as an electric space discharge device which is provided with means to form the electric space discharge into a restricted beam or ray, usually pencil-like.

(2) Note. Where a system includes the cathode-ray tube system as a part thereof, the patent is excluded and will be found with the particular art which provides for the complete

system.

(3) Note. These subclasses do not include systems which are limited by claimed subject matter to using the cathode-ray tube for controlling the current and/or potential supplied to a load device other than a cathode-ray tube, for which see the class appropriate to the load device. Where the output circuit claimed includes more circuit elements than is necessary for the mere current and/or potential supply for the cathode-ray tube, the system is considered to be limited to use for supplying and/or controlling the current and/or potential to load device and, therefore, excluded from these subclasses.

(4) Note. Systems which include a cath-ode-ray tube having either a discharge intensity modulating means or a discharge focusing means and discharge deflecting means are excluded from these subclasses where the claims include significant features of the circuits for supplying the controlling currents and/or potentials to the modulating means or focusing means and the deflecting means from the controlling source. For example, a system which includes means for separating the video or image and synchronizing signals from each other and applying them to the cathode-ray tube is classified with the art to which the system relates; i.e., television if the purpose of the system is to reproduce an optical image.

Included in these subclasses are systems which recite broadly means for applying current and/or potential to the intensity control means or the focusing means and to the deflecting electrodes as well as patents which claim systems for controlling the discharge intensity or the focusing solely in dependence upon conditions in the cathode-ray tube current or potential supply system, such as, for example, applying a control potential to the intensity control means or focusing means in dependence upon the rate of ray deflection or in dependence upon the direction of ray deflection (blackout circuits). (5) Note. Merely claiming either the source of signal potential for controlling the discharge intensity control means, the focusing means, or the discharge deflecting means will not exclude the patent from these subclasses as long as the source of signal potential is claimed broadly so that it could be any source of potential. Where the system claimed includes a source of signal potentials and means to separate the potentials and to apply one to the vertical sweep means, and the other to the horizontal sweep means, the patent is not excluded from these subclasses as long as the source of signal potential is claimed broadly and is no more than a source of periodic potentials. Where such synchronizing circuit for the ray deflecting means is claimed in addition to significant features of the ray modulating circuit, the patent is excluded.

(6) Note. Merely claiming the source of signals to control

the start of the ray deflecting circuit as a synchronizing potential will not exclude the patent from these subclasses as long as the source of ray deflecting control potential is claimed broadly and is only the control potential for the ray deflecting means.

(7) Note. These subclasses do not include the combination of a cathode-ray tube and mechanical or optical devices, such as lenses, mirrors, et cetera, which are used with the cathode-ray tube even if the system of supply for the cathode-ray tube is claimed. Merely using a voltage to deflect a cathode-ray beam so as to form a scale upon the screen of the cathode-ray tube will not exclude the patent from Class 315.

SEE OR SEARCH CLASS

250, Radiant Energy,

281+, for methods and apparatus for the ionic separation or analysis of materials utilizing the mass to electric charge ratio of ionic particles of the material.

313, Electric Lamp and Discharge Devices,

2.1, for the structural combination of a cathode-ray tube combined with an electric space discharge device or an electric lamp so as to form a unitary device, and subclasses 364+ for cathode-ray tube structures.

324, Electricity: Measuring and Testing,

88, for devices for indicating the phase relations of electric quantities, which devices comprise cathode-ray tubes, and subclass 121 for cathode-ray galvanometers. Where the system claimed includes means for applying a current or potential under examination, or an unknown current or voltage, to the cathode-ray tube, the system is not excluded from Class 315 unless some means is claimed to enable the desired information to be derived other than merely observing the trace of the ray on an uncharted luminous screen, or unless the cathode-ray tube is claimed in combination with significant features of the circuit to be investigated. Merely naming the circuit to be investigated as a source of pulsating or alternating current will not be sufficient to exclude the patent from Class 315.

329, Demodulators, for demodulators which may include an electron discharge device. 330, Amplifiers,

43, and 44+ for amplifier systems including electron beam tubes.

346, Recorders, appropriate subclass for cathode-ray devices in combination with photos:graphic recording means. Class

346 provides for such combinations where the system for operating the cathode-ray tube is claimed when the system is of general application and not otherwise classified.

348, Television,

284+, 325+, 377+, 379, 380+, and 805+ for television systems which include a cathode-ray tube. Cathode-ray tubes in combination with optical means, such as lenses, mirrors, etc., are in Class 386, subclass 130 when used for television, and Class 358, subclasses 500+ for synchronizing in facsimile systems which include a cathode-ray tube. See Notes (4), (5), and (6) above for the line between subclasses 500+ and those subclasses (1+).

378, X-Ray or Gamma Ray Systems or Devices,

91+, for X-ray tube circuits.