US PATENT SUBCLASS 148 / 110
.~.~ Silicon steel

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}
110.~.~ Silicon steel {2}
111  DF  .~.~.~> Working
112  DF  .~.~.~> Heat treatment {1}

DEFINITION

Classification: 148/110

(under subclass 100) Processes, restricted to the treatment of steel having at least 0.4% silicon.

(1) Note. A process reciting "silicon steel", and not specifying the silicon content, will be placed in this subclass if it comes within the definition of subclass 100.

(2) Note. The patents of this subclass embrace a larger combination of steps than those which are classified in indented subclasses 111 to 113, e.g., many of the patents of this subclass recite coating, pickling, or manipulation in addition to working and/or heat treatment. However, some operations which amount to no more than that of "providing" the material, such as a broad casting of the metal or the mere alloying of specified metals making up the material whose magnetic properties are to be altered, are not sufficient, by themselves, to place a combined process in this subclass. In such cases, classification will be in the appropriate indented subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

120+, for processes not classifiable in subclasses 100 to 108 for altering the magnetic properties of metallic material other than silicon steel.

579+, for processes of treating silicon steels which do not alter the magnetic properties of the material.