Acyclic Patents (Class 562/512)
- Purification or recovery per se (Class 562/554)
- Carbamic acids or salts thereof (Class 562/555)
- Sulfur or selenium (Class 562/556)
- Ureido, hydrazino, or nitrogen double bonded directly to carbon (Class 562/560)
- Plural nitrogens (Class 562/561)
- Oxy, aldehyde, or ketone (Class 562/567)
- Polycarboxylic (Class 562/571)
- Halogen or unsaturation (Class 562/574)
- Alpha nitrogen (Class 562/575)
- Beta alanine per se or salt thereof (Class 562/576)