Anti-oxidants Or Chemical Change Inhibitants Patents (Class 252/397)
- Component inorganic or organic comprising element other than C,H,O,N,S, and halogen (Class 252/400.1)
- Group IIA metal containing (Class 252/400.61)
- Alkali metal or NH4+ containing (Class 252/400.62)
- Amine, amide, azo, or nitrogen-base radical containing (Class 252/401)
- Phenol or quinone radical containing (Class 252/404)
- Nitrogen organic compound containing (Class 252/405)
- Sulphur organic compound containing (Class 252/406)
- Oxygen organic compound containing (Class 252/407)