US PATENT SUBCLASS 392 / 424
.~.~.~.~ Heating element in transparent tubular envelope

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

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
407  DF  .~ Radiant heater {10}
422  DF  .~.~ With reflector {4}
423  DF  .~.~.~ Elongated reflector {2}
424.~.~.~.~ Heating element in transparent tubular envelope

DEFINITION

Classification: 392/424

Heating element in transparent tubular envelope:

(under subclass 423) Subject matter wherein the heating device includes a tube shape enclosure enclosing the heating element and is translucent to the radiation.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices, appropriate subclasses for transparent tubular envelope.

338, Electrical Resistors,

234+, for gaseous or vacuum spacing between element and casing or housing.