US PATENT SUBCLASS 219 / 50
METAL HEATING (E.G., RESISTANCE HEATING)

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

50METAL HEATING (E.G., RESISTANCE HEATING) {19}
51  DF  .~> Chain {1}
53  DF  .~> Rail bond {2}
56  DF  .~> Wire, rod, or bar bonding {3}
59.1  DF  .~> Of cylinders (e.g., pipes and tubes) {14}
68  DF  .~> Cutting or disintegrating (e.g., machining engraving) {2}
71  DF  .~> Liquid electrode
72  DF  .~> Nonatmospheric environment at hot spot (e.g., resistance weld under oil, vacuum) {2}
76.1  DF  .~> For deposition welding (e.g., coating or building up) {6}
78.01  DF  .~> For bonding with pressure (e.g., resistance welding) {16}
121.11  DF  .~> By arc {16}
145.1  DF  .~> Weld rod structure {4}
146.1  DF  .~> Weld rod composition {6}
148  DF  .~> Bonding
149  DF  .~> With forging or shaping (e.g., of powder) {3}
155  DF  .~> Endless strip
156  DF  .~> Rods and bars
157  DF  .~> Rivets
158  DF  .~> Work holders {3}
162  DF  .~> Methods

DEFINITION

Classification: 219/50

(under the class definition) Subject matter relating to the electrical heating of metal.

(1) Note. The heating in this and indented subclasses is often, but not necessarily, accompanied by working of the metal.

(2) Note. The metal heated is a workpiece and is separable and distinct from the heater, which is a tool. However, heat may be developed within the metal by the passage of electric current.

(3) Note. The heating may be for welding, brazing, soldering, heat treating or other purpose.

(4) Note. The art in miscellaneous subclass 50 relates, for example, to mere heating of metal by the passing of an electric current through it.

(5) Note. Subclasses 7.5, 8.5, 9.5, and 50 to 162 were formed in 1956 by making official some unofficial digests which had been established during the previous two decades by the Examiners of Divisions 37 and 60. A caveat is given: While it is believed that the titles and definitions are reasonably correct, no assurance can be given that all of the patents, issued prior to the date of reclassification, are in the proper subclass, since the individual patents were not read during the reclassification project. Consequently, in making a thorough search in these subclasses, it is advisable to investigate every subclass which may possibly be pertinent and not, in order to shorten the search, to rely upon the principle of superiority of subclass subject matter because of position in the schedule, since the principle is applicable only in classes where each patent has been analyzed and placed in the schedule in accordance with that portion of the disclosed subject matter which is claimed. SEE OR SEARCH THIS CLASS, SUBCLASS:

600+, for this subject matter where the heating is inductive heating.

678+, for microwave heating.

764+, for capacitive dielectric heating.

SEE OR SEARCH CLASS

148, Metal Treatment, particularly

520, 525, and 565 for processes of significant heat treatment of metal to modify or maintain the internal physical structure (i.e., microstructure) or chemical property of metal wherein electrical heating is utilized. See Lines With Other Classes, "Metal Casing, Metal Fusion Bonding, Machining, or Working Classes" to determine what constitutes significant heat treatment.

373, Industrial Electric Heating Furnaces, appropriate subclasses where the metal is heated in an electric furnace.

428, Stock Material or Miscellaneous Articles,

934, for metallic stock produced by an electrical process, and subclass 939 for stock having a molten or fused coating.

483, Tool Changing, generally for a process or apparatus including a tool transfer means combined with either a tool support or storage means. A process or apparatus for electric heating wherein the sole significantly recited feature is changing a tool (e.g., a nonconsumable electrode) is properly classified in Class 483, and may be cross referenced into this class (Class 219, Electric Heating).