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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 423 | CHEMISTRY OF INORGANIC COMPOUNDS |
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| 700 | ZEOLITE |
| 701 | Organic compound used to form zeolite |
| 709 | Seed used |
| 710 | Aging to induce zeolite formation from inorganic mixture |
| 712 | Synthesized from naturally occurring product |
| 713 | Isomorphic metal substitution |
| 716 | With change of synthesized zeolite morphology |
| 718 | Structure defined X-ray diffraction pattern |
| 1 | TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND |
| 2 | Radioactive metal (At. No. 84+ or radioactive isotope of another metal) |
| 3 | Actinide series metal (At. No. 89+) |
| 4 | Removing cladding or coating from fuel element |
| 5 | Fusing |
| 6 | Ion exchanging or sorbing |
| 8 | Liquid-liquid extracting |
| 11 | Forming insoluble substance in liquid |
| 12 | By coprecipitating with carrier |
| 15 | Forming compound containing plural metals or metal and ammonium |
| 16 | Forming peroxide (e.g., U04, etc.) |
| 17 | Carbonate leaching |
| 18 | Acid leaching |
| 19 | Volatizing |
| 20 | Acid leaching |
| 21.1 | Rare earth metal (At. No. 21, 39, or 57-71) |
| 22 | Platinum group metal (Ru, Rh, Pd, Os, Ir, or Pt) |
| 23 | Group IB metal (Cu, Ag, or Au) |
| 24 | Ion exchanging or liquid-liquid extracting |
| 25 | Sorbing or magnetic separating |
| 26 | Flotation |
| 27 | Leaching, washing, or dissolving |
| 28 | Specified particle size |
| 29 | With a cyanide compound |
| 32 | With ammonia or ammonium containing compound |
| 34 | Forming insoluble substance in liquid |
| 38 | Halogenating |
| 41 | Sulfating |
| 42 | Forming insoluble substance in liquid |
| 44 | Volatizing copper, silver, or gold |
| 45 | Sulfating |
| 46 | Halogenating |
| 47 | Desulfurizing or de-arsenating |
| 48 | Forming sulfide or matte |
| 49 | Group VIIB metal (Mn, Tc, or Re) |
| 53 | Group VIB metal (Cr, Mo, or W) |
| 54 | Ion exchanging or liquid-liquid extracting |
| 55 | Forming insoluble substance in liquid |
| 59 | Volatizing |
| 61 | Forming compound containing plural metals |
| 62 | Group VB metal (V, Nb, or Ta) |
| 63 | Ion exchanging or liquid-liquid extracting |
| 64 | From organic liquids |
| 65 | Forming insoluble substance in liquid |
| 68 | Leaching, washing, or dissolving |
| 69 | Group IVB metal (Ti, Zr, or Hf) |
| 70 | Ion exchanging or liquid-liquid extracting |
| 71 | Forming compound containing plural metals |
| 73 | Separating Group IVB metals from each other |
| 74 | Utilizing fluidized bed |
| 75 | Volatizing |
| 80 | Chemically converting for physical solid-solid separation |
| 81 | Treating with nitrogen or nitrogenous compound |
| 82 | Treating with sulfur or halogen containing acid |
| 84 | Treating with compound containing alkali metal or alkaline earth metal |
| 85 | Forming insoluble compound containing Group IVB metal |
| 86 | Dissolving or leaching of iron |
| 87 | Group VA metal or arsenic (Sb, Bi, or As) |