Organic Dye Containing Patents (Class 106/31.27)
- Anthraquinone attached directly or indirectly to the nitrogen by nonionic bonding (Class 106/31.44)
- The nitrogen is part of a cyano group (Class 106/31.45)
- The nitrogen is a ring member of a heterocyclic ring (Class 106/31.46)
- The nitrogen is part of an acyclic azo group (Class 106/31.51)
- Protein or derivative containing (Class 106/31.53)