Ternary Compound Containing Hydrogen Patents (Class 423/521)
- Nitrogenous impurity or utilizing nitrogenous catalyst or reactant (Class 423/523)
- Starting material includes organic or carbonaceous impurity (Class 423/525)
- Subjecting reactants to pressure, vacuum, or steam (Class 423/529)
- Utilizing metal sulfate (Class 423/530)
- Purifying acid or reactant (Class 423/531)