US PATENT SUBCLASS 423 / 138
.~ Iron group metal (Fe, Co, or Ni)

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

1  DF  TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15}
138.~ Iron group metal (Fe, Co, or Ni) {7}
139  DF  .~.~> Ion exchanging or liquid-liquid extracting
140  DF  .~.~> Forming insoluble substance in liquid {4}
148  DF  .~.~> Utilizing fluidized bed
149  DF  .~.~> Volatizing iron, nickel, or cobalt
150.1  DF  .~.~> Leaching, washing, or dissolving {3}
151  DF  .~.~> Converting metal to magnetic form {1}
153  DF  .~.~> Desulfurizing {1}

DEFINITION

Classification: 423/138

(under subclass 1) Processes wherein the compound comprises one of the three metals in Period 4, Group VIII of the periodic system, i.e., iron, cobalt or nickel, commonly known as the iron group metals; see Glossary.

SEE OR SEARCH CLASS

588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for the destruction or containment of hazardous or toxic waste containing Fe, Co, and Ni.