US PATENT SUBCLASS 75 / 433
.~.~.~ Iron(Fe)


Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

330  DF  PROCESSES {9}
392  DF  .~ Producing or treating free metal {10}
414  DF  .~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7}
433.~.~.~ Iron(Fe) {18}
434  DF  .~.~.~.~> With concurrent production of hydraulic cement
435  DF  .~.~.~.~> With concurrent production of Titanium dioxide
436  DF  .~.~.~.~> With consolidation (e.g., pelletizing, etc.) of solid metallic Iron(Fe) product after reduction
437  DF  .~.~.~.~> Reducing Iron(Fe) halide
438  DF  .~.~.~.~> Making wrought Iron(Fe) {3}
443  DF  .~.~.~.~> Reducing in gaseous suspension {4}
458  DF  .~.~.~.~> Blast furnace reduction to produce molten Iron(Fe) {7}
473  DF  .~.~.~.~> Reduction in closed retort (e.g., Hoganas process, etc.)
474  DF  .~.~.~.~> Reduction in rotary kiln {3}
483  DF  .~.~.~.~> Superposed multiple hearth reduction
484  DF  .~.~.~.~> Moving furnace or hearth (e.g., moving belt, etc.) {1}
486  DF  .~.~.~.~> Heating reduction zone by heat conducted through walls of zone {1}
488  DF  .~.~.~.~> Reduction to metallic Iron(Fe) within shaft furnace {2}
500  DF  .~.~.~.~> Reduction in molten state {2}
503  DF  .~.~.~.~> Reduction in presence of solid Carbon(C) containing material (e.g., coke, coal, carbides, etc.) {1}
505  DF  .~.~.~.~> Reduction with externally applied gas (e.g., batch HyL process, etc.)
506  DF  .~.~.~.~> Reduction in the presence of liquid carbonaceous reductant (e.g., petroleum, pitch, etc.)
507  DF  .~.~.~.~> Melting Iron(Fe) or treating molten Iron {12}


DEFINITION

Classification: 75/433

Iron (Fe):

(under subclass 414) Process in which Iron (Fe) is produced or a metal that contains over 50 percent by weight Iron is treated.

(1) Note. The term "reducing" as used below in indented subclasses means that over 50 percent of the metallic Iron produced in the process must be obtained by reduction of an Iron compound (e.g., ore, etc.).

(2) Note. This and indented subclasses provide for treating a metal that contains over 50 percent by weight Iron in the molten state and melting a metal that contains over 50 percent by weight Iron.

(3) Note. This subclass contains patents drawn to processes of preheating ferrous scrap for subsequent metallurgical processing without actual melting.

(4) Note. Production of a ferroalloy, such as ferromanganese, ferrochromium, or nickeliferous pig Iron, where the percentage of the metals is unspecified will go as originals to the nonferrous metal subclass regardless of the fact that Iron (Fe) may be produced in the production of the ferroalloy. If the percentages of metals are specified the original will go to Class 420, Alloys or Metallic Compositions.

SEE OR SEARCH CLASS

148, Metal Treatment, appropriate subclasses for processes of treating solid or semi-solid metal to modify or maintain the internal physical structure (i.e., microstructure) or chemical properties of metal. See Class 148, 512, for processes including surface melting of the solid or semi-solid metal. However, if casting, welding, machining, or working is involved, there is a requirement of significant heat treatment as described in section III, A, of the Class 148 definition.

420, Alloys or Metallic Compositions,

88, for process of preparing ferrophosphorus whether or not any proportions are specified.

420, Alloys or Metallic Compositions,

117, for processes of preparing ferrosilicon containing over 50 percent Iron or wherein no relative proportions of Iron and Silicon are disclosed.

420, Alloys or Metallic Compositions,

121, for processes of preparing ferroboron containing over 50 percent Iron or wherein no relative proportions of Iron and Boron are specified.

420, Alloys or Metallic Compositions,

578, for processes of preparing ferrosilicon containing over 50 percent Silicon.

420, Alloys or Metallic Compositions,

591, for processes of preparing ferroboron containing over 50 percent Boron.