US PATENT SUBCLASS 392 / 482-- .~.~.~ Plural pipes or tubes form flow path

US PATENT SUBCLASS 392 / 482
.~.~.~ Plural pipes or tubes form flow path

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999 Terms of Use

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.