US PATENT SUBCLASS 392 / 458
.~.~.~ With external heater

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}
458.~.~.~ With external heater {3}
459  DF  .~.~.~.~> Clamped or secured to tank wall
460  DF  .~.~.~.~> Producing radiation
461  DF  .~.~.~.~> With externally mounted circulation-type heater {1}

DEFINITION

Classification: 392/458

With external heater:

(under subclass 449) wherein the heating device is located

outside of the tank and in heat exchange relation with the liquid to be heated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

400, for in line connected closed tank.

SEE OR SEARCH CLASS

119, Animal Husbandry,

73, for a temperature-controlled watering device, subclass 229 for a fish enclosure with a heat exchanger and subclass 262 for an aquarium with a heat exchanger.

219, Electric Heating, 424, for protecting means for heating unit or switch; subclass 436 for heating unit attaching or support means; subclasses 438+ for vessel combined with container; and subclass 535 for specially formed or adapted to fit material to be heated.

432, Heating,

225, for heat applicator having structure for mounting it on or around object to be heated.