US PATENT SUBCLASS 392 / 408
.~.~ With filter or diffuser for radiant energy

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}
408.~.~ With filter or diffuser for radiant energy

DEFINITION

Classification: 392/408

With filter or diffuser for radiant energy:

(under subclass 407) Subject matter wherein the radiant heater includes means for attenuating certain wavelengths while passing others with relatively no change, or means for scattering or dispersing radiation within selected wavelengths.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices,

110+, for optical or special ray transmissive envelope.

362, Illumination,

293, for selected wavelength modifier.