US PATENT SUBCLASS 392 / 469-- .~.~.~ Skin effect heater type (e.g., S.E.C.T., etc.)

US PATENT SUBCLASS 392 / 469
.~.~.~ Skin effect heater type (e.g., S.E.C.T., etc.)

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}
468	DF	.~.~ Pipeline tracing {1}
469		.~.~.~ Skin effect heater type (e.g., S.E.C.T., etc.)

DEFINITION

Classification: 392/469

Skin-effect heater type (e.g., S.E.C.T., etc.):

(under subclass 468) Subject matter wherein the resistance heating element of the pipeline length is accomplished by the flow of alternating current through the walls of a ferromagnetic pipe, and the current flow is confined to the interior of the ferromagnetic pipe.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

480+, for pipe or tube forms flow path.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

33, for electric thawing and freezing protection. 174, Electricity: Conductors and Insulators, appropriate subclasses for electrical conductors or conduits.