US PATENT SUBCLASS 392 / 453
.~.~.~.~ Removably insertable into tubular receptacle in tank

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}
453.~.~.~.~ Removably insertable into tubular receptacle in tank

DEFINITION

Classification: 392/453

Removably insertable into tubular receptacle in tank:

(under subclass 451) Subject matter wherein the heating device may be placed into or removed from a tube shaped water-tight receiver extending into the tank.

SEE OR SEARCH THIS CLASS, SUBCLASS:

398, for internal heating element for continuous flow line connected heater.

401, for internal heating element for in-line connected closed tank.

487+, for jacket for heating element.

497, for immersion heater details.

503, for particular sheath or jacket composition of immersion heater.

SEE OR SEARCH CLASS 219, Electric Heating,

523, for immersion type and subclass 534 for rigid tubular housing, casing or support.

338, Electrical Resistors,

232+, for casing or housing readily openable or separable from element.