US PATENT SUBCLASS 219 / 629
.~.~.~ By tube (i.e., pipe)

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

600  DF  INDUCTIVE HEATING {7}
618  DF  .~ With heat exchange {6}
628  DF  .~.~ Fluid or liquid heater {1}
629.~.~.~ By tube (i.e., pipe) {1}
630  DF  .~.~.~.~> Core or coil structure {1}

DEFINITION

Classification: 219/629

By tube (i.e., pipe):

(under subclass 628) Subject matter wherein the intermediate member is a hollow cylinder which transports a fluent material.

SEE OR SEARCH CLASS

392, Electric Resistance Heating Devices,

320+, for an electrical resistance heater with a tube or pipe forming a flow path.