US PATENT SUBCLASS 392 / 482
.~.~.~ Plural pipes or tubes form 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}
465  DF  .~ Continuous flow type fluid heater {12}
479  DF  .~.~ Externally heated line connected section {4}
482.~.~.~ Plural pipes or tubes form flow path


DEFINITION

Classification: 392/482

Plural pipes or tubes form flow path:

(under subclass 479) Subject matter wherein the flow path for the fluid to be heated comprises at least two or more fluid conveying hollow cylinders.

SEE OR SEARCH THIS CLASS, SUBCLASS:

320+, for tube or pipe forms flow path in fluid-in-circuit heater.

461, for externally mounted circulation type heater.

468+, for pipeline tracing.

472, for flexible hose.

478, for fluid conveying tube or pipe comprising resistive heating element.