US PATENT SUBCLASS 392 / 320
.~.~.~ Tube or pipe 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}
311  DF  .~ Fluid-in-circuit type heater {6}
314  DF  .~.~ Continuous flow of fluid being heated {4}
320.~.~.~ Tube or pipe forms flow path {1}
321  DF  .~.~.~.~> Pipe forms at least one electrode

DEFINITION

Classification: 392/320

Tube or pipe forms flow path:

(under subclass 314) Subject matter wherein the flow path for the fluid to be heated comprises a fluid conveying elongated tubular member.

SEE OR SEARCH THIS CLASS, SUBCLASS:

397+, for continuous flow line connected heater for vaporizer.

480+, for externally heated line connected section.

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

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