US PATENT SUBCLASS 219 / 628
.~.~ Fluid or liquid heater

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

600  DF  INDUCTIVE HEATING {7}
618  DF  .~ With heat exchange {6}
628.~.~ Fluid or liquid heater {1}
629  DF  .~.~.~> By tube (i.e., pipe) {1}

DEFINITION

Classification: 219/628

Fluid or liquid heater:

(under subclass 618) Subject matter wherein the intermediate member is arranged to transfer heat to a fluent material.

(1) Note. A fluent material is one that flows easily from container to container and may be a fine granular material, liquid, or air.

(2) Note. An inductively heated intermediate member is usually a conduit or container where the heat is to be supplied to a fluent material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

687+, for a microwave fluid heater.

772, for apparatus for dielectric heating a fluent material where the electromagnetic field acts directly on the fluent material.

SEE OR SEARCH CLASS

137, Fluid Handling,

341, having an electric heater.

138, Pipes and Tubular Conduits,

33, for fluid conduits with electric thawing and freeze protection means.

336, Inductor Devices,

55+, for the structure of transformers and inductive reactors with means to modify the temperature thereof.

392, Electric Resistance Heating Devices,

311+, for a noninductive electrical fluid heater.