The Hetero Ring Contains Five Members Including Nitrogen And Carbon (e.g., Polyvinylpyrrolidone, Etc.) Patents (Class 508/268)
- Chalcogen in the hetero ring (e.g., benzoxazoles, etc.) (Class 508/270)
- The chalcogen is sulfur (e.g., 1,3-thiazole,etc.) (Class 508/271)
- Chalcogen or nitrogen bonded directly to ring carbon of the hereto ring (e.g., 2-oxazolidinoes, etc.) (Class 508/277)
- Exactly one double bond in the hetero ring (e.g., bis-2-oxazolines, etc.) (Class 508/278)
- Three or four nitrogens in the hetero ring (e.g., 1,2,4-triazole, tetrazole, etc.) (Class 508/279)
- The hetero ring is a monocyclic 1,3-diazole or a monocyclic hydrogenated 1,3-diazole (Class 508/283)
- Chalcogen or nitrogen bonded directly to ring carbon of the 1,3-hetero ring , or the 1,3-hetero ring has two double bonds between ring members (Class 508/284)
- Having -C(=X)-, wherein X is chalcogen, attached indirectly to the 1,3- hetero ring by nonionic bonding (Class 508/285)
- Organic phosphorus compound salt of the 1,3-hetero ring compound, or an organic phosphorus compound is present (Class 508/286)
- Polycyclo ring system which contains the hetero ring as one of the cyclos (i.e., fused or bridged ring system) (Class 508/288)
- Sulfur attached directly or indirectly to the hetero ring by nonionic bonding (Class 508/289)
- Additional oxygen attached directly or indirectly to the hetero ring by nonionic bonding (Class 508/290)
- Nitrogen attached directly or indirectly to the hetero ring by nonionic bonding (Class 508/293)