US PATENT SUBCLASS 392 / 492
.~.~.~.~ Producing counterflow circulation

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

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
465  DF  .~ Continuous flow type fluid heater {12}
485  DF  .~.~ Heated line section with heating element internal of flow path {6}
491  DF  .~.~.~ With baffle-defined flow path {1}
492.~.~.~.~ Producing counterflow circulation {1}
493  DF  .~.~.~.~.~> Heating element integral with baffle

DEFINITION

Classification: 392/492

Producing counterflow circulation:

(under subclass 491) Subject matter wherein the baffle is arranged to reverse the direction of fluid flow flowing through the flow path at least once between the inlet and the outlet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

351, floor furnace type heater.

369, for counterflow of convection space heater.