US PATENT SUBCLASS 219 / 548
.~.~.~ Of particular construction or material

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
538  DF  .~ With heating unit structure {6}
546  DF  .~.~ Core, sheath, or support means for heating element {2}
548.~.~.~ Of particular construction or material {3}
549  DF  .~.~.~.~> Flexible
550  DF  .~.~.~.~> Sectional or interconnectable insulator means
551  DF  .~.~.~.~> Gasket or wafer-type insulator means

DEFINITION

Classification: 219/548

(under subclass 546) Subject matter wherein the core, sheath or support means is compromised of a significant material or is constructed in a particular manner.

SEE OR SEARCH THIS CLASS, SUBCLASS:

354, for fluid heaters of the radiant type with heating unit structure of particular construction or material.

409+, for oven with heating unit structure or composition.

426, for furnace with heating unit of particular structure or composition.

468, for planar surface heater with heating unit with particular resistance element structure or material.

553, for heating element of particular construction or material.

SEE OR SEARCH CLASS

338, Electrical Resistors, appropriate subclasses for resistor means with a significant core or sheath.