(under the class definition) Devices provided with electrical shielding means or with means for distributing the static charges which accumulate upon the parts of the device or for the prevention of the accumulation of static charges upon parts of the device or for preventing undesired electric space discharges, such as arcs, between the parts of the device.
(1) Note. For a definition of shield, see the glossary.
(2) Note. This subclass includes devices provided with means to prevent the accumulation of undesired static discharges upon the envelope of the device. This subclass also includes devices provided with means to prevent electric space discharges between the lead wires for the electrodes of the device.
(3) Note. This is the residual subclass and provides for all lamp and discharge devices which are not specifically provided for in the preceding subclasses which have an electrical shield or a static charge distribution means combined therewith. Accordingly, cross-references have been placed in this subclass of patents classified in the preceding subclasses of lamps and discharge devices having an electrical shield or static charge distribution means excepting in the case where such patent is classified in a specific subclass preceding this subclass which provides for such subject matter. A complete field of search for this subject matter will therefore include the subclasses set forth in the notes below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11+, where the shield is a heated shield or is provided with means for modifying the temperature of the shield (having a heat radiating surface), see indented subclass 33 for devices having an envelope and an internal temperature modifying baffle, and subclass 38 for devices having a heat shield for the filament or heated cathode. 134, for spark plugs having an electrical shield (e.g., radio shielding).
168, for liquid electrode discharge devices (e.g., mercury) which have the anodes shielded from each other by being placed in separate chambers of the envelope.
169, for liquid electrode discharge devices having a plurality of anodes with one or more anode arc shields.
590, 592, 597+, 608, 609+, 614, 616, and 626, where the device includes an envelope containing a gas or vapor. Where the device is a discharge device having three or more electrodes see subclasses 590, 592 and 597+. See subclass 590 where a shield is interposed between two of the electrodes to prevent a discharge therebetween, subclass 592 where there is a hollow shield which surrounds at least a part of the discharge path and which has an apertured or grid-like electrode within the shield and subclasses 597+ where an apertured or grid-like electrode (e.g., shield electrode) is interposed between two other electrodes. See subclass 608 where a discharge device has particulate material between the discharge electrodes, subclasses 609+ where a discharge device has a partition, baffle,
constricting means or a portion of the envelope wall interposed in the discharge space between the electrodes, subclass 614 for discharge devices provided with an anode shield, subclass 616 for discharge devices which are provided with a positive ion or cathode shield, and subclass 626 for lamps and discharge devices which have a shield for the electrode or an electrode support.
239+, where the device is provided with significant supporting and/or spacing structure for the shield.
293+, for discharge devices which have an apertured or grid-like electrode (e.g., a shield electrode) interposed in the discharge space between two electrodes, see subclass 293, where the discharge device has in addition a fourth electrode or shield disposed outside of the discharge space.
326+, for the structure of shields, per se.
SEE OR SEARCH CLASS
174, Electricity: Conductors and Insulators,
35+, for miscellaneous electrical shields or screens, per se, and for envelopes, boxes and housings which are of general utility (including those similar to those used for electric lamps and discharge devices) which are provided with or include as a part thereof an electromagnetic or electrostatic shielding means, subclasses 140+ for insulators provided with conductive means to modify the electrical characteristics of the insulator, including arcing horns, means for preventing the concentration of electrical stresses, means for modifying surface resistance, and grading means for modifying the voltage gradient.
315, Electric Lamp and Discharge Devices: Systems, 32, for electric lamps and space discharge devices which have a condenser, inductance or other circuit element structurally combined therewith so as to form a unitary device. Electric lamps and discharge devices which are provided with a condenser or other circuit impedance to modify the distribution of electrostatic charges upon the parts of the lamp or discharge device are in Class 315, subclasses 32+. Note indented subclasses 58+ of Class 315 and the subclasses specified in the notes to the definition of those subclasses where a discharge device is structurally combined with a condenser or other circuit impedance, and subclass 85 for electrical systems for electric lamps and electric space discharge devices having shielding means for part of the system to prevent radiation of electromagnetic waves from and/or to the system or some part thereof.
378, X-Ray or Gamma Ray Systems or Devices,
139, for X-ray discharge devices having electrostatic field stress distributing means for increasing the impedance of the
dielectric paths between the electrodes and subclass 143 for X-ray tubes having means for absorbing the secondary X-ray radiation.
