US PATENT SUBCLASS 392 / 489
.~.~.~.~ 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}
488  DF  .~.~.~ Pipe or tube forms flow path {1}
489.~.~.~.~ With jacket for heating element

DEFINITION

Classification: 392/489

With jacket for heating element:

(under subclass 488) Subject matter wherein the heating element is enclosed by an outer protective covering.

SEE OR SEARCH THIS CLASS, SUBCLASS:

487, for plural pipe or tube forming flow path.

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