US PATENT SUBCLASS 219 / 600
INDUCTIVE HEATING

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

600INDUCTIVE HEATING {7}
601  DF  .~> With diverse-type heating
602  DF  .~> Metal working {1}
618  DF  .~> With heat exchange {6}
635  DF  .~> Specific heating application {8}
647  DF  .~> With workpiece support {7}
660  DF  .~> With power supply system {3}
672  DF  .~> Specific inductor configuration {5}

DEFINITION

Classification: 219/600

INDUCTIVE HEATING:

(under the class definition) Subject matter for electric heating whereby an electromagnetic field interacts in close proximity to an electrically conducting material or object causing current to flow through a material or object and producing heat proportional to a resistance of the material or object.

(1) Note. Inductive, capacitive dielectric, and microwave heating applications are in the radio frequency region of the electromagnetic spectrum, with the exception of inductive heating which may be in a frequency range as low as 50 hertz. Specifically, inductive and capacitive dielectric heating are commonly in the frequency ranges from 1000 hertz to 1 gigahertz, and microwave heating is in the frequency ranges from 1 gigahertz to 3 gigahertz (also called microwave range).

(2) Note. For claims reciting both food (edible) and nonfood (nonedible) heating by an electric heating device or method, classification is proper for Class 219. If the claims recited are limited to food (edible) heating methods, composition, product, or processes, classification is proper for Class 426.

(3) Note. The heating may be combined with working the metallic or nonmetallic material heated.

(4) Note. The work may have electric current or potential induced therein and thus constitute the secondary of a transformer, or it may be a continuation of the inductor core.

(5) Note. A closed transformer secondary may be the inductively heated member for the purpose of heat transfer.

(6) Note. An inductive heating apparatus with corona prevention means, shock protection means, and the like, is classified herein.

(7) Note. An inductive heater with means to heat the inductor to prevent condensation thereon is classified herein. (8) Note. An inductive heating apparatus with means to prevent dissipation of heat from the work by simultaneously heating the work holder or support is classified herein.

(9) Note. This subclass and the indented subclasses include inductive heating having means for applying pressure to the work (see subclass 659) or for cooling the inductor apparatus during the application of electrical energy (see subclass 632). If the cooling apparatus is provided for use subsequent to the heating or is for the purpose of treating the material or object being heated, classification is proper with the art collection to which it pertains.

SEE OR SEARCH THIS CLASS, SUBCLASS:

108+, especially indented subclass 116 for electric supply systems for heating metal where the work is heated by connecting it in series with the secondary of a transformer so as to complete a conductive current path from the secondary through the work. In subclasses 108+, the transformer secondary is not the heated member, nor is the workpiece a part of the secondary of the transformer.

SEE OR SEARCH CLASS

118, Coating Apparatus,

50.1, 620+, and 724+ for means to apply electrical and/or radiant energy to work and/or coating.

148, Metal Treatment, for metal fusion bonding or working of metal, is combined with significant heat treatment of metal as defined in the Class Definition of Class 148.

156, Adhesive Bonding and Miscellaneous Chemical Manufacture,

272.2+, for methods and subclasses 379.6+ for means of surface bonding and/or assembly thereof with direct application of electrical, magnetic, or radiant energy to work.

204, Chemistry: Electrical and Wave Energy, 193+, for apparatus for treating substances with electrical or radiant energy to effect a chemical change.

266, Metallurgical Apparatus, appropriate subclasses for miscellaneous apparatus particularly adapted for the treatment of metals and metalliferous material. Class 266,

129, provides for apparatus having inductive heating means in combination with other heat treatment means such as quenching apparatus.

373, Industrial Electric Heating Furnaces, appropriate subclasses for miscellaneous electrical furnaces; see

4, 6, 7, and 138+ for induction furnaces.

600, Surgery,

9+, for a magnetic field applied to the body for therapeutic purposes.

606, Surgery,

27+, or 32+ for instruments for heat or electrical application.

607, Surgery: Light, Thermal, and Electrical Application,

1+, for light and thermal application to the body and subclasses 114 through 156 for an electrical energy applicator.