Halogen Or Compound Thereof Patents (Class 423/462)
- Refractory metal (Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, or W) (Class 423/492)
- Iron group metal or copper (Fe, Co, Ni, or Cu) (Class 423/493)
- Group IVA metal (Ge, Sn, or Pb) (Class 423/494)
- Group IIIA metal or beryllium (Al, Ga, In, Tl, or Be) (Class 423/495)
- Alkaline earth metal (Mg, Ca, Sr, or Ba) (Class 423/497)
- Alkali metal (Class 423/499.1)
- Ion exchanging or liquid-liquid extracting (Class 423/501)
- Oxidizing catalytically (Class 423/502)
- Sorbing (Class 423/503)
- From mixture containing alkali metal or alkaline earth metal (Class 423/504)
- By reacting alkali metal halide with sulfur compound (Class 423/506)
- By reacting hydrogen halide or ammonium halide (Class 423/507)