US PATENT SUBCLASS 219 / 200
HEATING DEVICES

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

200HEATING DEVICES {14}
201  DF  .~> Combined with diverse-type art device {12}
221  DF  .~> Tool or instrument {2}
243  DF  .~> Combined with pressure application means {2}
260  DF  .~> Resistive element: igniter type {6}
383  DF  .~> Electric arc-type devices {1}
385  DF  .~> Combined with container, enclosure, or support for material to be heated {12}
472  DF  .~> Plural functions simultaneously or convertible {2}
475  DF  .~> With plural heat utilization means (single heater)
476  DF  .~> Plural separate heating devices {4}
481  DF  .~> With protective means for heater
482  DF  .~> With power supply and voltage or current regulation or current control means {4}
507  DF  .~> With current connection and/or disconnection means (e.g., switch) {2}
520  DF  .~> With heater-unit housing, casing, or support means (e.g., frame and single sheet) {13}
538  DF  .~> With heating unit structure {6}

DEFINITION

Classification: 219/200

(under the class definition) Subject matter which includes significant structural details of miscellaneous devices of general utility whereby electrical energy is converted to thermal energy and in which thermal energy is utilized to raise the temperature of some material or object from a first value to a second higher value and not otherwise classifiable above in this class or other art class. In order to be classifiable in this class the claimed subject matter should include only means for utilizing the thermal energy generated in general terms.

(1) Note. The patents in this and the indented subclasses include only those devices in which the claimed subject matter includes specific details of electrical heating means whereby thermal energy is generated and transmitted to a space or an object (load) with no significant structural details of the load recited.

(2) Note. The heating devices to be found herein include specifically recited electrical heating devices combined with material to be heated in which the claimed combination does not constitute a part of a system or apparatus properly classified in another art class and subcombinations or elements of such heating devices which do not of themselves comprise subject matter classifiable elsewhere.

(3) Note. Patents in which the claimed subject matter is restricted to methods of heating and in which no apparatus claims appear will not ordinarily be classified in this or

the indented subclasses, except in cases where an apparatus of the type, which if claimed, would be classifiable in this class, is shown and disclosed and there is no other appropriate class for the method alone.

(4) Note. Patents claiming the combination of particular art device structure with electric heater structure are, in general, classified with the particular art device.

(5) Note. Patents in which the claimed subject matter includes means to effect a change of physical state or of chemical composition of a material, and which may include electric heating means, will not be found in this class, but in the appropriate physical or chemical change class to which it appertains. The only exceptions provided for in this class are electric water heaters which may in the process of heating the water, generate steam or vapor and wherein no specific use of the steam or vapor aside from assisting in the heating function is claimed and electrically heated vessels and crucibles which may be utilized for melting material at low melting temperatures. (6) Note. Patents in which the claimed subject matter includes both heating and cooling of a material in sequence will not ordinarily be found in this class. Class 165 is the generic class relating to the transfer of heat from one material to another and includes all means for modifying temperature not found in other classes. Subclass 58 of Class 165, e.g., provides for selectively or simultaneously heating and cooling external material. For other classes and subclasses utilizing heat exchange, see "SEARCH CLASS" under the class definition of Class 165.

(7) Note. See "SEARCH CLASS" under Paragraph II in the class definition above and see SEARCH CLASS notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50+, for electrical metal heating apparatus or methods.

600+, for inductive heating.

678+, for microwave heating.

764+, for capacitive dielectric heating.

SEE OR SEARCH CLASS

15, Brushing, Scrubbing, and General Cleaning,

250.05+, for window cleaning attachments combined with heating means (including electrical heaters). (See (7) Note, above.)

36, Boots, Shoes, and Leggings,

2.6, for those with heaters. (See (7) Note, above.)

53, Package Making,

373.7, and see the "Notes" thereto for heat seaming combined with a packaging operations. (See (7) Note, above.)

99, Foods and Beverages: Apparatus,

324+, for cooking apparatus, especially subclass 358 for electrode type of cooking apparatus that heats food by running electricity through it.

100, Presses,

92+, for a press including means of treating material by heating, cooling, or drying.

126, Stoves and Furnaces,

204+, for body warmers having nonelectrical heating means. (See (7) Note, above.)

165, Heat Exchange, see (6) Note above. 196, Mineral Oils: Apparatus,

121, for electrically heated mineral oil apparatus. (See (7) Note, above.)

201, Distillation: Processes, Thermolytic, 19, for a thermolytic distillation process in which the distilland is heated by electrical energy. (See (7) Note, above.)

204, Chemistry: Electrical and Wave Energy, for chemical processes and apparatus for utilizing electrical energy for purposes other than mere heating. (See (7) Note, above.)

250, Radiant Energy,

324, for methods and apparatus to irradiate objects by corona irradiations, subclasses 428+ for methods and apparatus to contain, support or transport fluent material with or without irradiating the material, subclasses 453.11+ for methods and apparatus to support an object with or without an irradiating source and subclasses 492.1+ for methods and apparatus to irradiate objects or material. (See (7) Note, above.)

313, Electric Lamp and Discharge Devices,

337, for indirectly heated cathodes for electric space discharge devices which consist of a heater and a separate cathode surface which is to be heated thereby. (See (7) Note, above.)

338, Electrical Resistors, appropriate subclasses, for electrical resistors commonly called heaters but not

characterized by some feature especially adapting the unit for use as a heater. See also the reference to Class 338 under the class definition above, and also see the class definition of Class 338. (See (7) Note, above.)

374, Thermal Measuring and Testing,

182, for a thermocouple thermometer having reference junction temperature control. (See (7) Note, above.)

383, Flexible Bags,

901, for nonelectrical heating bag. (See (7) Note, above.) 604, Surgery,

114, for electrical means for heating or cooling the body device, or the treating material introduced or removed from the body. (See (7) Note, above.)

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

96, for devices for modifying the temperature of the body limited by claimed structure to therapeutic use. (See (7) Note, above.)