US PATENT SUBCLASS 392 / 500
.~.~ With plural heating elements

Current as of: June, 1999
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392 /   HD   ELECTRIC RESISTANCE HEATING DEVICES

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
497  DF  .~ Immersion heater details {6}
500.~.~ With plural heating elements

DEFINITION

Classification: 392/500

With plural heating elements:

(under subclass 497) Subject matter wherein the heater includes two or more immersed heating elements.

SEE OR SEARCH CLASS

219, Electric Heating,

476+, for plural separate heating devices; subclass 523 for housing, casing or support insertable into material or space to be heated; subclass 537 for heating units combined with single casing, housing or support; and subclass 539 for heating unit structure comprising plural separate and distinct resistive elements.

338, Electrical Resistors,

260+, for plural resistors and subclasses 319+ for plural resistors extending between supports.