US PATENT SUBCLASS 219 / 423
.~.~.~ With protection means for heating unit or switch

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

200  DF  HEATING DEVICES {14}
385  DF  .~ Combined with container, enclosure, or support for material to be heated {12}
420  DF  .~.~ Crucible or furnace type (i.e., adapted to hold meltable material) {6}
423.~.~.~ With protection means for heating unit or switch

DEFINITION

Classification: 219/423

(under subclass 420) Subject matter including means whereby the heating unit or units are protected from damage, deterioration, or destruction either from causes arising from normal usage, such as burn out due to excessive current, or from external forces.

SEE OR SEARCH THIS CLASS, SUBCLASS:

481, for heating devices in general under the class definition combined with protective means.

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Devices,

1+, for electrical power systems or devices combined with safety or protection means.