US PATENT SUBCLASS 219 / 553
.~.~.~ Of particular construction and/or material (e.g., infrared generator)

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

200  DF  HEATING DEVICES {14}
538  DF  .~ With heating unit structure {6}
552  DF  .~.~ Heating element structure {1}
553.~.~.~ Of particular construction and/or material (e.g., infrared generator)

DEFINITION

Classification: 219/553

(under subclass 552) Subject matter wherein the significant resistance or other type element comprises particular structural elements or is made from a specific material; such, for example, as carbon pellets or granular material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

354, for fluid heaters of the radiant type with heating

element of particular construction or composition.

548+, for heater unit element core, sheath or support means of particular construction or material.