US PATENT SUBCLASS 392 / 328
.~.~.~.~.~ By pressure

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

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
311  DF  .~ Fluid-in-circuit type heater {6}
324  DF  .~.~ Steam or vapor generator {2}
325  DF  .~.~.~ Line connected boiler {3}
326  DF  .~.~.~.~ Control of electrode immersion level {2}
328.~.~.~.~.~ By pressure

DEFINITION

Classification: 392/328

By pressure:

(under subclass 326) Subject matter wherein the electrode immersion level is controlled by the exertion of force of vapor in the boiler.

SEE OR SEARCH CLASS

219, Electric Heating,

496, for heaters in general with current control responsive to the pressure of the medium being heated.

338, Electrical Resistors,

38, for fluid pressure responsive to liquid element resistors.