US PATENT SUBCLASS 75 / 508
.~.~.~.~.~ Vacuum treatment of molten 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  DF  .~.~.~ Iron(Fe) {18}
507  DF  .~.~.~.~ Melting Iron(Fe) or treating molten Iron {12}
508.~.~.~.~.~ Vacuum treatment of molten Iron(Fe) {3}
509  DF  .~.~.~.~.~.~> Free falling stream or spray of molten Iron(Fe)
510  DF  .~.~.~.~.~.~> Vacuum lift {1}
512  DF  .~.~.~.~.~.~> With addition of gas


DEFINITION

Classification: 75/508

Vacuum treatment of molten Iron (Fe):

(under subclass 507) Process wherein a molten metal that contains over 50 percent by weight Iron (Fe) is treated in a gas pressure significantly less than one atmosphere pressure.

(1) Note. The low pressure must be intentional in order to treat the molten metal. Merely melting metal where atmospheric pressure is low will not cause a patent to be placed hereunder, unless the low pressure is intentionally employed to treat the molten metal.