Bituminous Material Or Tarry Residue Patents (Class 106/273.1)
- Fibrous (Class 106/282)
- Water containing (Class 106/283)
- Coal tar or pitch containing (Class 106/284)
- Specified particle or screen-mesh size stated (Class 106/284.01)
- Heavy metal or aluminum containing (Class 106/284.02)
- Alkali or alkaline earth metal containing (Class 106/284.03)
- Elemental carbon containing (Class 106/284.05)
- Nitrogen containing (Class 106/284.06)