Organic Compound Containing Patents (Class 252/399)
- Phosphorus containing (Class 252/400.2)
- Silicon containing (Class 252/400.3)
- Boron containing (Class 252/400.4)
- Chromium containing (Class 252/400.5)
- Lead containing (Class 252/400.51)
- Zinc or aluminium containing (Class 252/400.52)
- Nickel, iron, cobalt, copper, manganese, mercury, or cadmium containing (Class 252/400.53)
- Molybdenum, arsenic, antimony, vanadium, bismuth, tungsten, selenium, or tellurium containing (Class 252/400.54)