US PATENT SUBCLASS 148 / 104
.~.~ Dust cores

Current as of: June, 1999
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148 /   HD   METAL TREATMENT

95  DF  PROCESS OF MODIFYING OR MAINTAINING INTERNAL PHYSICAL STRUCTURE (I.E., MICROSTRUCTURE) OR CHEMICAL PROPERTIES OF METAL, PROCESS OF REACTIVE COATING OF METAL AND PROCESS OF CHEMICAL-HEAT REMOVING (E.G., FLAME-CUTTING, ETC.) OR BURNING OF METAL {17}
100  DF  .~ Magnetic materials {7}
104.~.~ Dust cores

DEFINITION

Classification: 148/104

(under subclass 100) Processes in which comminuted metallic material, the particles of which are usually separated from each other by electrically insulating material, is compacted into self-sustaining form, or in which a previously produced dust core is subjected to a treatment not classifiable elsewhere.

(1) Note. For the line involving Classes 29, 148 and 252 relative to methods of producing magnetic material or stock, see (3) Note and the search notes following the definition of subclass 100 of this class.

(2) Note. To be classified in this subclass, a process must recite a treatment in addition to that of compacting, which alters or preserves the magnetic properties of the material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

513, for processes of heat treating particulate metal not involving altering the magnetic properties thereof.

SEE OR SEARCH CLASS 252, Compositions,

62.51, for processes of making magnetic compositions, including the steps of magnetizing and/or broad molding, even though a metallic component is intentionally included in the composition providing the composition is not subjected to a heat treatment which alters the internal structure of such component. See the search note to Class 252 under Class 148, subclass 100.

336, Inductor Devices,

223, and 234 for dust cores recited in terms of significant structure.