US PATENT SUBCLASS 75 / 757
.~.~.~.~ With gas recycling or reusing

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}
746  DF  .~ Consolidating metalliferous material (e.g., ore, tailings, flue dust, fluxes, etc.) by agglomerating, compacting, or heat treating; preparatory process therefor; or treating consolidated material therefrom {5}
751  DF  .~.~ With heat treatment (e.g., calcinating, fusing, indurating, roasting, sintering, vaporizing, etc.) {8}
755  DF  .~.~.~ On moving grate, moving pallet, or endless belt {3}
757.~.~.~.~ With gas recycling or reusing

DEFINITION

Classification: 75/757

With gas recycling for reusing:

(under subclass 755) Process wherein gas used or produced in the heat treatment is recycled or reused in the same heat treatment process or in a diverse operation.