| Class 148: METAL TREATMENT / U.S. Patent Classification Definitions (13255 words) |
 | Class 148, Metal Treatment, subclasses 95-122, 194-287, and 500-714 providing for processes of modifying or maintaining the internal physical structure (i.e., microstructure) or chemical properties of metal, processes of reactive coating of metal and processes of chemical-heat removing (e.g., flame-cutting) or burning of metal. |
| Semiconductor stock in Class 148, subclasses 33-33.6, must be essentially homogeneous and have at least two contiguous layers differing in the number of unbound electrons and/or differing in energy gap levels, which exhibit a junction between the layers. |
| This and indented subclasses of Class 148 provide for patents directed to metal heat treating compositions where, in addition to the heat exchange function the composition, or any of its constituents, reacts chemically, with the metal or any of its alloy constituents to form coatings, metal compounds, etc., or to case harden the work. |
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