Marking Patents (Class 106/31.01)
- Invisible (Class 106/31.14)
- Emulsion (Class 106/31.25)
- Organic dye containing (Class 106/31.27)
- Pigment containing (Class 106/31.6)
- Bituminous material or tarry residue containing (Class 106/31.91)
- Electrically conductive or magnetic compositions (e.g., electrically sensitive, electrochemical, electrolytic, etc.) (Class 106/31.92)