US PATENT SUBCLASS 219 / 420
.~.~ Crucible or furnace type (i.e., adapted to hold meltable material)

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.~.~ Crucible or furnace type (i.e., adapted to hold meltable material) {6}
421  DF  .~.~.~> Melting pot
422  DF  .~.~.~> With plural separate heating units
423  DF  .~.~.~> With protection means for heating unit or switch
424  DF  .~.~.~> With resistance heating element surrounding or embedded within walls of container
425  DF  .~.~.~> With current or voltage control means
426  DF  .~.~.~> With significant heating unit structure or composition {1}

DEFINITION

Classification: 219/420

(under subclass 385) Subject matter wherein the special container or enclosure structure includes: (1) a vessel or melting pot of some very refractory substance, such as clay, graphite, porcelain, or a relatively infusible metal, used for melting solid substances which require a high degree of heat or (2) an enclosed structure comprised of a very highly refractory substance whereby a very high degree of heat may

be transferred to a solid material contained therein.

(1) Note. The patents in this and the indented subclasses are directed to subject matter similar in nature to the subject matter classified in Class 373, subclasses 109+, the difference being that herein significant details of the electric heating means are claimed with the furnace being either broadly claimed or recited only as an environment for a specific heating device. Class 219 is the generic class of electrical heating and generally takes only those patents which do not claim (or in some cases disclose) sufficient structure to be classified in a specific art class. In order to complete the search for the subject matter classified in this and indented subclasses, the appropriate subject matter in Class 13 should be considered.

SEE OR SEARCH CLASS

65, Glass Manufacturing,

347, for melting pot or furnace structure adapted for the manufacture of glass.

126, Stoves and Furnaces, 284, for devices primarily designed for the melting of glue and analogous substances (the pots are usually water or steam jacketed), subclass 343.5 for heaters especially adapted for melting substances by the application of heat to a receptacle, conduit or support for the material to be melted and other appropriate subclasses for significant furnace structure.

164, Metal Founding,

335+, for metal casting apparatus including a ladle or crucible type metal receptacle.

266, Metallurgical Apparatus,

171+, and 220+ for furnaces adapted for the treatment of metals and metal bearing ores.

432, Heating,

156+, for a residual nonelectric furnace or one having a merely nominal electrical heater particularly adapted to heat material in a crucible; and subclasses 262+ for a residual crucible, per se.