Anti-corrosion Patents (Class 252/387)
- Component inorganic or organic comprising element other than C,H,O,N,S, and halogen (Class 252/389.1)
- Amine, amide, azo, or nitrogen-base radical containing (Class 252/390)
- Phenol or quinone radical containing (Class 252/393)
- Nitrogen organic compound containing (Class 252/394)
- Sulphur organic compound containing (Class 252/395)
- Oxygen organic compound containing (Class 252/396)