US PATENT SUBCLASS 392 / 486
.~.~.~ 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}
485  DF  .~.~ Heated line section with heating element internal of flow path {6}
486.~.~.~ Plural pipes or tubes form flow path

DEFINITION

Classification: 392/486

Plural pipes or tubes form flow path:

(under subclass 465) Subject matter wherein the flow path for the fluid to be heated comprises two or more fluid conveying hollow cylinders.

SEE OR SEARCH THIS CLASS, SUBCLASS:

314+, for continuous flow of fluid being heated.

468+, for pipeline tracing.

472, for flexible hose.

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

482, for plural pipes or tubes forming flow path.