Ureas (i.e., Hnh-co-hnh, Wherein Substitution May Be Made For Hydrogen Only) Patents (Class 564/32)
- Benzene ring bonded directly to urea nitrogen (i.e., anilides) (Class 564/48)
- The benzene ring is part of a substituent which contains sulfur (Class 564/49)
- The benzene ring is part of a substituent which contains nitrogen (Class 564/50)
- The benzene ring is part of a substituent which contains oxygen (Class 564/52)
- The benzene ring is part of a substituent which contains halogen bonded directly to carbon (Class 564/53)
- Plural benzene rings bonded directly to urea nitrogen (Class 564/55)
- Aralkyl bonded directly to urea nitrogen (Class 564/56)
- Preparing directly from cyano containing compound (Class 564/64)
- Preparing directly from ammonia and carbonmonoxide or carbon oxysulfide (e.g., from ammonia and COS, etc.) (Class 564/65)
- Preparing directly from ammonium carbamate (i.e., from HNH-COO-HHNHH) (Class 564/66)
- Preparing directly from ammonia and carbon dioxide (Class 564/67)
- Purification or recovery (Class 564/73)