US PATENT SUBCLASS 392 / 461
.~.~.~.~ With externally mounted circulation-type 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  DF  .~.~.~ With external heater {3}
461.~.~.~.~ With externally mounted circulation-type heater {1}
462  DF  .~.~.~.~.~> Laterally disposed (i.e., side-arm type)

DEFINITION

Classification: 392/461

With externally mounted circulation-type heater:

(under subclass 458) Subject matter wherein the liquid of the tank is heated as it flows through an external flow heater having an inlet for receiving cold liquid from the tank and an outlet for returning heated liquid to the tank.

SEE OR SEARCH THIS CLASS, SUBCLASS:

322, for reservoir or tank.

377, for heat exchange fluid.

465+, for continuous flow type fluid heater.

471, for combined liquid flow heater and pump unit.

479+, for externally heated line connected section.

485+, for heated line section with heating element internal of flow path. SEE OR SEARCH CLASS

126, Stoves and Furnaces,

344+, for water heaters and subclass 362 for stand boiler circulation.

165, Heat Exchange,

108, for recirculation and subclass 132 for heating or cooling means in open communication with reservoir.