US PATENT SUBCLASS 252 / 500
ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

500ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS {6}
501.1  DF  .~> Light sensitive
502  DF  .~> Elemental carbon containing {5}
512  DF  .~> Free metal containing {3}
516  DF  .~> Carbide containing
517  DF  .~> Radioactive material containing
518.1  DF  .~> Metal compound containing {16}

DEFINITION

Classification: 252/500

(under the class definition) Compositions which either conduct or emit electrons not provided for above.

(1) Note. This is the residual home for all conductive and emissive compositions and all electrical devices defined solely in terms of their composition with no claimed significant device structure. By way of example only, these devices are electrodes, filaments or shields for electric lamps and electric space discharge devices, welding electrodes, contacts, switches, brushes, and resistances.

(2) Note. Where the device is claimed in terms of the composition of which it is composed and also in terms of significant device structure, it is classified in the appropriate class providing for such art devices. See the search notes below for such art classes.

(3) Note. Where a patent contains claims to the electrical device defined only by its composition classified in this or indented subclasses and also claims to a method of preparing such device provided for in another class, the patent is classified in this class (252) and cross-referenced to such other class. See the search notes below for other classes which provide for methods of making electrical devices.

(4) Note. This and indented subclasses are superior to other composition classes as to coating or plastic compositions useful in making or coating electrical devices. See Lines With Other Classes and Within This Class, Lines For Particular Class 252 Subclass Areas, for a discussion of the lines between this area and other classes.

(5) Note. Where the claimed electrically conductive or emissive device is defined in terms of only a single material, it is classified in the appropriate class providing for such material. SEE OR SEARCH THIS CLASS, SUBCLASS:

62.2, for electrolytes for electrical devices such as rectifiers and condensers.

62.3, for barrier layer device compositions.

62.5, for magnetic compositions.

62.9, for piezoelectric compositions.

181.1+, for compositions specialized for use as getters for electric lamps and electric space discharge devices and for materials and compositions specialized for use in generating a gas or vapor within the container of an electric lamp or electric space discharge device. Where the composition has utility as a getter or gas or vapor generating material within the envelope of an electric lamp or electric space discharge device, and also as an electrode or filament useful

for purposes other than gettering or generating a gas or vapor (e.g., emitting electrons), it is classified in subclasses 181.1+ and cross-referenced to subclasses 500+.

301.1, for radio-active compositions and materials.

301.16, through 301.6, for fluorescent and phosphorescent compositions and materials.

502+, for electrically conductive or emissive compositions comprising carbon.

570+, for fluent dielectric compositions ("insulating oils") which contain a hydrocarbon and a nonhydrocarbon.

SEE OR SEARCH CLASS 75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,

228+, for products with a continuous phase of metal made by consolidating metal particles which are electrically conductive or emissive.

96, Gas Separation: Apparatus,

95, and 98 for electrode stock material or composite which has been specifically altered, configured, or constructed for use in electric or electrostatic field separation apparatus for gas separation.

106, Compositions: Coating or Plastic, appropriate subclasses for miscellaneous coating, impregnating and plastic compositions including electrical insulating compositions. See the (2) Note of the class definition of Class 106, and the reference to this class (252) therein.

148, Metal Treatment,

240+, for processes of treating solid metal with a reactive material to form a coating thereon.

200, Electricity: Circuit Makers and Breakers,

166, for contacts and switches wherein there is significant structure of the device claimed whether or not the device is also defined in terms of the composition of which it is composed.

204, Chemistry: Electrical and Wave Energy,

280+, for electrodes and electrode compositions specialized for use in electrolytic apparatus adapted to carry out processes within the scope of Class 204.

219, Electric Heating,

50+, for arc welding and heating of metal. Note particularly indented subclasses 146.1+ for welding electrodes.

264, Plastic and Nonmetallic Article Shaping or Treating: Processes, appropriate subclasses for processes within the class definition, for production of articles which may be disclosed to be electrodes for electrical devices or electrical conductors. In particular, see

61+, and 104+. Subclasses 165+ pertains to forming of continuous or indefinite length articles, e.g., filamentary products. See subclass 30 for furnace lining formation or repair and see the notes thereto.

310, Electrical Generator or Motor Structure,

252+, for electric current conducting brushes wherein there is significant brush structure whether or not the composition of which the brushes are composed is recited.

313, Electric Lamp and Discharge Devices,

311, and the subclasses specified in the Notes thereto for discharge devices which have an electrode defined by the composition or material of which it is composed, and subclasses 326+ for filaments, electrodes and shields for electric lamps and electric space discharge devices which are defined by significant structure of the device, whether or not the composition of the device is recited.

337, Electricity: Electrothermally or Thermally Actuated Switches, appropriate subclasses for electrothermal and thermally actuated switches with contacts of a particular material or composition of material especially

270+, and 416+ for particular fusible material.

338, Electrical Resistors, appropriate subclasses, for electrical resistors wherein there is significant resistance structure of the device claimed, whether or not the device is also defined in terms of the composition of the element or terminals.

373, Industrial Electric Heating Furnaces, 88+, and 71+ for furnace electrodes and furnace linings, respectively, of specific composition where combined with furnace structure or when defined in terms of significant electrode or lining structure.

381, Electrical Audio Signal Processing Systems and Devices,

179+, for resistance element used in the transmission of sound by means of electricity recited in terms of significant resistant structure.

419, Powder Metallurgy Processes,

4, for powder metallurgical methods for producing filaments or fibers.

420, Alloys or Metallic Compositions, for single metals and for alloys and metallic compositions.

427, Coating Processes,

58+, for processes of coating, per se, wherein the product is an electrical article.

428, Stock Material or Miscellaneous Articles, appropriate subclasses, especially

375+, 408, 411+, 539.5, 545, 553+, and 615+ for a mere impregnated or coated base which may exhibit electrically conductive and emissive properties. Such coated bases include electrodes, filaments and shields for electric lamps and discharge devices, welding electrodes, resistances, brushes, contacts, wires and electrodes in general which are not specifically provided for elsewhere, or do not include sufficient structure to indicate classification elsewhere.

429, Chemistry: Electrical Current Producing Apparatus, Product and Process, 209+, for battery electrodes.

445, Electric Lamp or Space Discharge Component or Device Manufacturing, and the classes specified in the notes thereto for process and apparatus for the manufacture of electrical conductors or emitters such as electrodes or emitters such as electrodes or shields for electric space discharge devices.

505, Superconductor Technology: Apparatus, Material, Process,

100+, for high temperature (Tc 30 K) superconducting materials, per se, or subclasses 300+ for processes of producing same.