US PATENT SUBCLASS 75 / 513
.~.~.~.~.~ In reverberatory furnace (e.g., open-hearth, Siemens-Martin, puddling, etc.)


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  DF  .~.~.~ Iron(Fe) {18}
507  DF  .~.~.~.~ Melting Iron(Fe) or treating molten Iron {12}
513.~.~.~.~.~ In reverberatory furnace (e.g., open-hearth, Siemens-Martin, puddling, etc.) {9}
514  DF  .~.~.~.~.~.~> With treating of molten Iron(Fe) with gas outside reverberatory furnace (e.g., in Bessemer converter, etc.)
515  DF  .~.~.~.~.~.~> With melting Iron(Fe) in shaft furnace
516  DF  .~.~.~.~.~.~> Using gaseous Oxygen in a higher concentration than in ambient air
517  DF  .~.~.~.~.~.~> With addition of solid elemental Carbon(C) or employing elemental Carbon furnace lining
518  DF  .~.~.~.~.~.~> With compound containing Alkali metal and Oxygen (e.g., Sodium nitrate, Sodium carbonate, etc.)
519  DF  .~.~.~.~.~.~> With Halogen or Halogen containing compound (e.g., Sodium chloride, Fluorspar, etc.)
520  DF  .~.~.~.~.~.~> With Alkaline earth metal or Magnesium(Mg) containing compound
521  DF  .~.~.~.~.~.~> With Transition metal compound {1}
523  DF  .~.~.~.~.~.~> Melting solid Iron(Fe)


DEFINITION

Classification: 75/513

In reverberatory furnace (e.g., open-hearth, Siemens-Martin, puddling, etc.):

(under subclass 507) Process which is carried out in a reverberatory furnace. A reverberatory furnace is one in which solid fuel is not burned in contact with the liquid or solid metal that contains over 50 percent by weight Iron (Fe). There is a roof over the hearth in which the metal is melted or the molten metal is treated, and either solid fuel is burned next to the hearth, but under the roof, by which means heat is reflected onto the metal by the roof, or in which gaseous fuel is burned over the metal in the hearth and heat is reflected down onto the hearth by the roof.

(1) Note. Common names of furnaces which are reverberatory are for example, open-hearth, Siemens-Martin and puddling.