US PATENT SUBCLASS 392 / 397
.~.~.~.~ Pipe or tube forms flow path

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.~.~.~.~ Pipe or tube forms flow path {1}
398  DF  .~.~.~.~.~> With internal heating element

DEFINITION

Classification: 392/397

Pipe or tube forms flow path:

(under subclass 396) Subject matter wherein the flow path for the liquid to be evaporated is a liquid-conveying long passage or tube.

SEE OR SEARCH THIS CLASS, SUBCLASS:

320, for pipe or tube section forming flow passage with fluid-in-circuit.

478, for fluid conveying tube or pipe.

480+, for pipe or tube forming flow path in continuous fluid heater.

488+, for pipe or tube forming flow path in with heating elements internal of flow path.