US PATENT SUBCLASS 392 / 454
.~.~.~.~ Plural heating zones

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

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
441  DF  .~ Tank or container type liquid heater {4}
449  DF  .~.~ Line connected tank {4}
451  DF  .~.~.~ With immersion heating element {6}
454.~.~.~.~ Plural heating zones

DEFINITION

Classification: 392/454

Plural heating zones:

(under subclass 451) Subject matter wherein the heating device is located in at least two or more separate areas of the tank to be heated.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

344+, for water heaters.

236, Automatic Temperature and Humidity Regulation,

1, for burner control and for multistage controls.