US PATENT SUBCLASS 392 / 487
.~.~.~ With jacket for heating element

Current as of: June, 1999
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392 /   HD   ELECTRIC RESISTANCE HEATING DEVICES

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
465  DF  .~ Continuous flow type fluid heater {12}
485  DF  .~.~ Heated line section with heating element internal of flow path {6}
487.~.~.~ With jacket for heating element

DEFINITION

Classification: 392/487

With jacket for heating element:

(under subclass 485) Subject matter wherein the heating element is enclosed by an outer protective covering.

SEE OR SEARCH THIS CLASS, SUBCLASS:

489, for single pipe or tube forming flow path.

503, for particular sheath or jacket composition of immersion heater.

SEE OR SEARCH CLASS

165, Heat Exchange,

177+, for tubular structure.

219, Electric Heating, 437, for immersible heating unit attaching or support means; subclass 520 for heater-unit housing, casing or support means; subclass 523 for housing, casing or support insertable into material or space to be heated; subclass 534 for rigid tubular housing, casing or support; subclass 544 for element imbedded within or completely surrounded by core, sheath or support means; and subclass 548 for particular construction or material.

338, Electrical Resistors,

226+, for incased, embedded, or housed.