US PATENT SUBCLASS 392 / 398
.~.~.~.~.~ With internal 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}
386  DF  .~ Vaporizer {7}
394  DF  .~.~ Liquid evaporant (e.g., water, etc.) {6}
396  DF  .~.~.~ In continuous flow line connected heater {1}
397  DF  .~.~.~.~ Pipe or tube forms flow path {1}
398.~.~.~.~.~ With internal heating element

DEFINITION

Classification: 392/398

With internal heating element:

(under subclass 397) Subject matter wherein an electrical resistance heating element is located within the pipe or tube.

SEE OR SEARCH THIS CLASS, SUBCLASS:

320, for tube or pipe forming flow path.

485+, for heated line section with heating element internal of flow path.