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 [Search a list of Patent Appplications for class 392]   CLASS 392,ELECTRIC RESISTANCE HEATING DEVICES
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SUBCLASSES

[List of Patents for class 392 subclass 301]    301Borehole type:
 This subclass is indented under subclass 200.  Subject matter under Class 219, ... wherein the heating device comprising an electrical resistance heating element is disclosed for use in an elongated hole in the earth.
(1) Note. The patents classified here are for electrical oil well heaters, per se. The combination of a heater and sufficient well structure is in Class 166.

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165, Heat Exchange,   subclass 45 for geographical heat exchange.
166, Wells,   subclasses 57+ and 272.1+ for well apparatus comprising a heater in the well and see subclass 60 for the line between Classes 166 and 219. See, also, (1) Note above.
175, Boring or Penetrating the Earth,   subclasses 16+ for an electrical heating process or device for forming a hole in the earth by directly applying heat to fluidize or comminute the material forming the earth.
299, Mining or In Situ Disintegration of Hard Material,   subclasses 3+ for mining by in situ conversion of solid to fluid and which includes heating means or steps and subclass 14 for process of directly applying heat.
405, Hydraulic and Earth Engineering,   subclass 131 for temperature modification or control of earthen formation by heating.
432, Heating,   subclass 62 for geographic or structural installation.
  
[List of Patents for class 392 subclass 302]    302With heat exchange fluid:
 This subclass is indented under subclass 301.  Subject matter wherein the heating device comprises a fluid which is heated by the heating element, and the heated fluid conveys its heat to the well or bore.

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357,for intermediate heat absorber.
456,for heat exchange fluid line connected heated storage tank.
496,for continuous fluid heater.

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165, Heat Exchange,   subclasses 104.11+ for intermediate fluent heat exchange material receiving and discharging heat.
  
[List of Patents for class 392 subclass 303]    303With vapor generator:
 This subclass is indented under subclass 301.  Subject matter wherein the heating device includes means for converting a substance from a solid or liquid to a gaseous state.

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324+,for fluid-in-circuit circuit type heater.
342,for vaporization by stored heat.
386+,for vaporizer.
  
[List of Patents for class 392 subclass 304]    304Heating element surrounding delivery pipe:
 This subclass is indented under subclass 301.  Subject matter wherein the heating element encircles an outer surface of a tube inserted into the well for conveying fluid into or out of the well.

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468+,for pipeline tracing fluid heater.
472,for flexible hose type fluid heater.
479+,for externally heated line connected section for fluid heater.
  
[List of Patents for class 392 subclass 305]    305Suspended by cable in well:
 This subclass is indented under subclass 301.  Subject matter wherein the heating device is supported from a well-head by a flexible line-like member.
  
[List of Patents for class 392 subclass 306]    306Plural separate heating devices:
 This subclass is indented under subclass 301.  Subject matter wherein the borehole contains two or more heating devices spaced from one another so that heating devices can heat different portions of the borehole.
  
[List of Patents for class 392 subclass 307]    307Combined with nonelectric heating means (e.g., gas, etc.):
 This subclass is indented under subclass 200.  Subject matter under Class 219, ... wherein the heating device comprises an electrical heating element in combination with at least one other heat source of a nonelectrical nature, e.g., gas, etc.
(1) Note. The other heat source may be utilized either simultaneously or alternately with the electrical device.

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219, Electric Heating,   subclass 601 for inductive heating with diverse type heating; for microwave heating see subclass 679 with a diverse device and subclasses 680+ with diverse-type heating.
432, Heating,   subclass 94 for disparate heat sources or fuels.
  
[List of Patents for class 392 subclass 308]    308For heating liquid:
 This subclass is indented under subclass 307.  Subject matter wherein the heating device is for heating a substance in that state in which the particles move freely among themselves but without tendency to separate.

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311+,for heating liquid by fluid-in-circuit type heater.
441+,for tank or container type liquid heater.
465+,for continuous flow type fluid heater.

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122, Liquid Heaters and Vaporizers,   appropriate subclasses for liquid heaters and vaporizers.
126, Stoves and Furnaces,   for general heat applying apparatus having other than electrical heating means, subclasses 344 through 363.1for a liquid heater that may include a kettle, a steam generator, stove pipe for use with a stove, a domestic water heater or boiler (e.g., kitchen boiler, range boiler, etc.) for use with a stove or furnace.
165, Heat Exchange,   appropriate subclasses for heating liquid by utilizing heat exchange.
237, Heating Systems,   appropriate subclasses for heating liquid by heating systems.
  
[List of Patents for class 392 subclass 309]    309Hot plate:
 This subclass is indented under subclass 307.  Subject matter wherein the heating device includes means on which a removable vessel is to be heated.

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467,for hot plate of a continuous flow type fluid heater.

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99, Foods and Beverages: Apparatus,   subclasses 279+ for infusors.
126, Stoves and Furnaces,   appropriate subclasses for hot plate type.
219, Electric Heating,   subclasses 443.1+ for an exposed planar support surface for material to be heated (e.g., hot plate, etc.).
  
[List of Patents for class 392 subclass 310]    310Oven type:
 This subclass is indented under subclass 307.  Subject matter wherein the heating device includes an enclosed chamber for containing the material to be heated.

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126, Stoves and Furnaces,   subclasses 273+ for oven.
219, Electric Heating,   subclasses 678+ for microwave heating, and subclasses 391+ for electrically heated ovens.
  
[List of Patents for class 392 subclass 311]    311Fluid-in-circuit type heater:
 This subclass is indented under subclass 200.  Subject matter under Class 219, ... wherein the heating device includes an electrically conductive fluid, e.g., water, heated by passing an electric current directly through the conductive fluid between two or more spaced conductors in electrical contact with the fluid, whereby the conductive fluid itself acts as an electric resistance element.

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34, Drying and Gas or Vapor Contact With Solids,   subclasses 245+ for material subjected to electrical energy.
99, Foods and Beverages: Apparatus,   subclass 358 for electrode type and subclass 451 for electric, radiant or vibrational treating means.
122, Liquid Heaters and Vaporizers,   using means other than electricity to generate heat, subclasses 13.01 through 19.2for a stand boiler (e.g., water heater, etc.) that provides hot water for domestic or household use (e.g., cooking, cleaning, washing, bathing, space heating, etc.) that may be in other than a house or home (e.g., apartment building, office building, restaurant, laundry, recreational vehicle, etc.).
201, Distillation: Processes, Thermolytic,   subclass 19 for applying electric energy directly to material.
210, Liquid Purification or Separation,   subclass 748 for utilizing electrical or wave energy directly applied to liquid.
219, Electric Heating,   subclasses 600+ for inductive heating, note subclass 628 heat exchange by fluid or liquid; subclasses 678+ for microwave heating, note subclass 687 for a fluid heater; and subclasses 764+ for capacitive dielectric heating.
338, Electrical Resistors,   subclasses 80+ for liquid resistance element.
373, Industrial Electric Heating Furnaces,   subclasses 29+ for joule effect heating and subclasses 120+ for charge internal resistance heating.
426, Foods or Edible Material: Processes, Compositions, and Products,   subclasses 234+ for passage of electric current through food material.
  
[List of Patents for class 392 subclass 312]    312Method:
 This subclass is indented under subclass 311.  Subject matter comprising processes for heating fluid by utilizing the liquid itself as an electrical resistance and passing electrical energy therethrough.

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426, Foods or Edible Material: Processes, Compositions, and Products,   subclasses 237+ for direct application of electrical or wave energy to food material and, particularly, subclasses 244+ for involving dielectric heating or passage of electric current through food material.
  
[List of Patents for class 392 subclass 313]    313Portable:
 This subclass is indented under subclass 311.  Subject matter wherein the fluid-in-circuit heater may be lifted or carried bodily from place-to-place by hand.

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219, Electric Heating,   subclass 523 for housing, casing or support insertable into material or support to be heated.
  
[List of Patents for class 392 subclass 314]    314Continuous flow of fluid being heated:
 This subclass is indented under subclass 311.  Subject matter wherein the fluid-in-circuit heater comprises a flow path for the uninterrupted flow of fluid to be heated, an inlet connected to a pressurized source of fluid and the electrodes arranged with the fluid flow path for heating the fluid while it uninterruptedly flows through the path.

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396+,for continuous flow line connected heater for vaporizer.
465+,for continuous flow type fluid heater.
  
[List of Patents for class 392 subclass 315]    315With means to adjust current path between electrodes:
 This subclass is indented under subclass 314.  Subject matter including means to vary the effective length or cross-sectional area of the current flow between the electrodes.
(1) Note. Generally the varying of the current path results in varying the resistance of the path and consequently the magnitude of the current.

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323,for reservoir or tank.
329,for line connected boiler.
334,for manually filled tank or container.

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338, Electrical Resistors,   subclasses 80+ for mechanically variable or adjustable liquid resistors.
  
[List of Patents for class 392 subclass 316]    316Responsive to condition of fluid:
 This subclass is indented under subclass 315.  Subject matter wherein the continuous fluid-in-circuit heater includes means which senses and responds to the fluid to adjust the current path between the electrodes.
  
[List of Patents for class 392 subclass 317]    317Movable dielectric means:
 This subclass is indented under subclass 315.  Subject matter wherein the current path is adjusted by a shiftable electrical insulation means interposed between or surrounding the electrodes whereby the passage of current between the electrodes may be controlled.

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330,for adjusting current path between electrodes in line connected boiler.

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338, Electrical Resistors,   subclass 82 for fluid resistance devices with an adjustable insulating barrier between electrodes.
  
[List of Patents for class 392 subclass 318]    318Current control means:
 This subclass is indented under subclass 314.  Subject matter wherein the fluid-in-circuit heater includes means to vary the flow of electrical current between an external source of current and the heating device.

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219, Electric Heating,   subclasses 507+ for significant current connection means for heating devices in general under the class definition.
  
[List of Patents for class 392 subclass 319]    319With discharge member for line or tank:
 This subclass is indented under subclass 314.  Subject matter wherein the continuous fluid-in-circuit heater includes means defining a passage or vent for permitting the fluid to flow out of a supply line or receptacle.

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473+,for fluid heater with discharge member.

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137, Fluid Handling,   subclasses 334+ for systems with heating or cooling.
222, Dispensing,   subclasses 146.1+ for fluid dispensing with heating.
239, Fluid Sprinkling, Spraying, and Diffusing,   subclasses 128+ for means for heating or cooling the system or fluid, and particularly 133 for spray member having heater.
604, Surgery,   subclasses 113 and 114 for means for electrically cooling or heating body.
  
[List of Patents for class 392 subclass 320]    320Tube or pipe forms flow path:
 This subclass is indented under subclass 314.  Subject matter wherein the flow path for the fluid to be heated comprises a fluid conveying elongated tubular member.

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397+,for continuous flow line connected heater for vaporizer.
480+,for externally heated line connected section.
486,for heated line section with heating element internal of flow path.
488+,for pipe or tube forming flow path with heating element internal of flow path.
  
[List of Patents for class 392 subclass 321]    321Pipe forms at least one electrode:
 This subclass is indented under subclass 320.  Subject matter wherein the pipe structure comprises at least one of the electrodes.
  
[List of Patents for class 392 subclass 322]    322With reservoir or tank:
 This subclass is indented under subclass 311.  Subject matter wherein fluid-in-circuit heater includes a container for heating a fixed quantity of fluid held therein.

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400+,for vaporizer.
441+,for container type liquid heater.

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99, Foods and Beverages: Apparatus,   subclasses 279+ for infusers with a liquid supply, subclass 358 for an electrode type cooking device, subclasses 403+ for cooking devices of the boiler or deep-fat fryer type, and subclass 451 for a device that subjects food to an electric or high-frequency energy.
122, Liquid Heaters and Vaporizers,   appropriate subclasses for water heaters utilizing a boiler type tank, particularly subclasses 13.1+ for stand boiler.
137, Fluid Handling,   subclass 334 for systems utilizing electric heating means and which may utilize tanks.
  
[List of Patents for class 392 subclass 323]    323With means to adjust current path between electrodes:
 This subclass is indented under subclass 322.  Subject matter including means to vary the effective length or cross-sectional area of the current flow between the electrodes.
(1) Note. Generally the varying of the current path by subject matter of this subclass type results in varying the resistance of the path and consequently the magnitude of the current.

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315,for continuous flow of fluid being heated.
329,for line connected boiler.
334,for manually filled tank or container.

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338, Electrical Resistors,   particularly subclasses 80+ for mechanically variable or adjustable liquid resistors.
  
[List of Patents for class 392 subclass 324]    324Steam or vapor generator:
 This subclass is indented under subclass 311.  Subject matter wherein the fluid-in-circuit heater includes means for converting a fluid material to a vapor or gas state.

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303,for borehole type heater.
342,for vaporization by stored heat.
386+,for vaporizer.

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4, Baths, Closets, Sinks, and Spittoons,   subclasses 524+ and 535+ for means for applying vapor in a bath.
38, Textiles: Ironing or Smoothing,   subclasses 69 and 77.1+ for steam iron.
43, Fishing, Trapping, and Vermin Destroying,   subclasses 125+ for vaporizers in fumigating apparatus.
48, Gas: Heating and Illuminating,   subclasses 89+ and 103 for retort by electric heater.
122, Liquid Heaters and Vaporizers,   appropriate subclasses for apparatus for generating vapors from liquids and further utilizing the vapors thus generated, e.g., steam generator. The structure found in this class is very similar to those found in Class 219, especially the so-called flashers in subclasses 40+ and wick in subclass 366.
123, Internal-Combustion Engines,   subclasses 434+ and 543+ for charge forming devices involving vaporizers.
126, Stoves and Furnaces,   for general heat applying apparatus having other than electrical heating means, subclasses 20 through 20.2for a cooking stove having an oven heated by steam or hot water, subclasses 369-369.3 for a steam chamber for food, or subclasses 377.1-392.1 for an open-top liquid heating vessel that may include a lid having a confining, directing or shielding feature for a liquid or steam used to heat the vessel.
128, Surgery,   subclasses 203.12+ for vaporizers for medicaments.
132, Toilet,   subclasses 228 and 272 for hair shaping curls by steam.
159, Concentrating Evaporators,   appropriate subclasses for devices for the concentration of solids held in solution or suspension by evaporation.
196, Mineral Oils: Apparatus,   subclass 104 for vaporizing mineral oil, and subclasses 121 for electric heating.
201, Distillation: Processes, Thermolytic,   subclass 19 for applying electrical energy directly to material.
202, Distillation: Apparatus,   appropriate subclasses for distillation apparatus in general.
203, Distillation: Processes, Separatory,   appropriate subclasses for a process of distilling a liquid.
208, Mineral Oils: Processes and Products,   subclasses 313 and 347+ for a process of distilling mineral oils.
223, Apparel Apparatus,   subclass 51 for apparel apparatus by heating and steaming.
237, Heating Systems,   subclasses 9 , 16+, and 67 for heating systems by steam.
239, Fluid Sprinkling, Spraying, and Diffusing,   subclass 136 for sprays with means to generate a water vapor or steam.
252, Compositions,   subclasses 67+ for specific compositions useful for vaporization purposes.
261, Gas and Liquid Contact Apparatus,   subclasses 127+ for external supply or removal of heat and subclass 142 for heat produced by electricity.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclass 305 for fume generating apparatus and 292+ for sterilizers using steam.
431, Combustion,   subclasses 208 and 258 for a fuel burner having an electrically heated fuel vaporizer.
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,   subclasses 1+ for continuous gas or vapor phase colloid system (e.g., smoke, fog, aerosol, cloud, mist) or agents for such systems or making or stabilizing such systems or agents, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.
607, Surgery: Light, Thermal, and Electrical Application,   subclasses 81+ for bathing apparatus.
  
[List of Patents for class 392 subclass 325]    325Line connected boiler:
 This subclass is indented under subclass 324.  Subject matter wherein the fluid-in-circuit heater includes a vessel having an inlet for receiving water from an external source of supply and an outlet for discharging vapor from the vessel.

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400+,for vaporizing in-line connected tank.
449,for liquid heating container or tank.
  
[List of Patents for class 392 subclass 326]    326Control of electrode immersion level:
 This subclass is indented under subclass 325.  Subject matter wherein the boiler includes means to control the depth of the electrode immersed in the water to be heated.

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338, Electrical Resistors,   subclasses 80+ and 86 for level of liquid element adjustable on electrodes.
  
[List of Patents for class 392 subclass 327]    327By electrode current:
 This subclass is indented under subclass 326.  Subject matter wherein the electrode immersion level is controlled by the magnitude of current flow between the electrodes.
  
[List of Patents for class 392 subclass 328]    328By pressure:
 This subclass is indented under subclass 326.  Subject matter wherein the electrode immersion level is controlled by the exertion of force of vapor in the boiler.

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219, Electric Heating,   subclass 496 for heaters in general with current control responsive to the pressure of the medium being heated.
338, Electrical Resistors,   subclass 38 for fluid pressure responsive to liquid element resistors.
  
[List of Patents for class 392 subclass 329]    329With means to adjust current path between electrodes:
 This subclass is indented under subclass 325.  Subject matter including means to vary the effective length or cross-sectional area of the current flow between the electrodes.
(1) Note. Generally the varying of the current path results in varying the resistance of the path and consequently the magnitude of the current.

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315,for continuous flow of fluid being heated.
322,for reservoir or tank.
334,for manually filled tank or container.

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323, Electricity: Power Supply or Regulation Systems,   subclass 296 for voltage or current regulating systems utilizing liquid resistors.
338, Electrical Resistors,   particularly subclasses 80+ for mechanically variable or adjustable liquid resistors.
373, Industrial Electric Heating Furnaces,   subclasses 29 and 120+ for electric furnace structure including adjustable electrodes.
  
[List of Patents for class 392 subclass 330]    330Movable dielectric means:
 This subclass is indented under subclass 329.  Subject matter wherein the current path is adjusted by a shiftable electrical insulation means interposed between or surrounding the electrodes whereby the passage of current between the electrodes may be controlled.

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317,for continuous flow of fluid being heated.

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338, Electrical Resistors,   subclass 82 for fluid resistance devices with an adjustable insulating barrier between electrodes.
  
[List of Patents for class 392 subclass 331]    331Electrode arrangement:
 This subclass is indented under subclass 325.  Subject matter including details of the manner in which the conductors are arranged to distribute the current in-line connected boiler.

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373, Industrial Electric Heating Furnaces,   subclasses 29+ and 120+ for electrode details of electric heating furnaces.
  
[List of Patents for class 392 subclass 332]    332Water jet electrode:
 This subclass is indented under subclass 331.  Subject matter wherein the electrode arrangement includes one electrode which spurts out a stream of water directed at another electrode.
  
[List of Patents for class 392 subclass 333]    333Manually filled tank or container:
 This subclass is indented under subclass 324.  Subject matter wherein the vapor generator includes a vessel with an opening through which the vessel is filled by hand.

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403+,for container with self-contained evaporant supply.
442,for manually pour-in liquid type tank.

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68, Textiles: Fluid Treating Apparatus,   subclass 223 for washboards.
239, Fluid Sprinkling, Spraying, and Diffusing,   subclasses 128+ for means for heating or cooling the system or fluid.
  
[List of Patents for class 392 subclass 334]    334With means to adjust current path between electrodes:
 This subclass is indented under subclass 333.  Subject matter including means to vary the effective length or cross-sectional area of the current flow between the electrodes.
(1) Note. Generally the varying of the current path results in varying the resistance of the path and consequently the magnitude of the current.

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315,for continuous flow of fluid in fluid-in-circuit type heater.
323,for reservoir or tank.
329,for line connected boiler.

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323, Electricity: Power Supply or Regulation Systems,   subclass 296 for voltage or current regulating systems utilizing liquid resistors.
338, Electrical Resistors,   particularly subclasses 80+ for mechanically variable or adjustable liquid resistors.
373, Industrial Electric Heating Furnaces,   subclasses 29+ and 120+ for electric furnace structure including adjustable electrodes.
  
[List of Patents for class 392 subclass 335]    335With supply interlock means:
 This subclass is indented under subclass 333.  Subject matter wherein the tank or container includes means for preventing the flow of water into the container while the electrodes are electrically energized.

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200, Electricity: Circuit Makers and Breakers,   subclass 50 for interlocking switch arrangements.
219, Electric Heating,   subclass 437 for immersible heating unit.
  
[List of Patents for class 392 subclass 336]    336Separate electrode compartment:
 This subclass is indented under subclass 333.  Subject matter wherein the tank or container includes a distinct section containing the electrodes to isolate the electrodes from the remainder of the tank or container.

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405,for separate heating chamber.
445,for immersible heating unit attaching or support means.

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4, Baths, Closets, Sinks, and Spittoons,   subclasses 524+ and 535+ for means for applying vapor in a bath.
219, Electric Heating,   subclass 437 for immersible heating unit.
338, Electrical Resistors,   particularly subclasses 80+ for mechanically variable or adjustable liquid resistors.
  
[List of Patents for class 392 subclass 337]    337Electrode compartment removable from tank:
 This subclass is indented under subclass 336.  Subject matter wherein the separate electrode compartment may be separated from the tank.

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406,for removable container with self- contained evaporant supply.
  
[List of Patents for class 392 subclass 338]