US PATENT SUBCLASS 392 / 448
.~.~.~.~ Removably inserted through fill opening

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}
444  DF  .~.~ Portable container or tank {3}
447  DF  .~.~.~ With internally positioned heating element {1}
448.~.~.~.~ Removably inserted through fill opening

DEFINITION

Classification: 392/448

Removably inserted through fill opening:

(under subclass 447) Subject matter wherein the heating element positioned internally of the container or tank may be readily placed into or removed from the tank through a hole through which the quantity of liquid to be heated is poured

in the container or tank.

SEE OR SEARCH CLASS

119, Animal Husbandry,

229, for a fish enclosure with a heat exchanger and subclass 262 for an aquarium with a heat exchanger.