US PATENT SUBCLASS 392 / 321
.~.~.~.~ Pipe forms at least one electrode

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  DF  .~.~.~ Tube or pipe forms flow path {1}
321.~.~.~.~ Pipe forms at least one electrode

DEFINITION

Classification: 392/321

Pipe forms at least one electrode:

(under subclass 320) Subject matter wherein the pipe structure comprises at least one of the electrodes.