Heterocyclic Ring Compound; A Heterocyclic Ring Is One Having As Ring Members Only Carbon And At Least One Hetero Atom Selected From Nitrogen And Chalcogen (i.e., Oxygen, Sulfur, Selenium, Or Tellurium) Patents (Class 508/243)
- Chalcogen in the hetero ring (Class 508/245)
- Plural nitrogens in the hetero ring (Class 508/255)
- Polycyclo ring system which contains the hetero ring as one of the cyclos (Class 508/261)
- Piperidines (Class 508/262)
- Vinyl pyridine polymer (e.g., polyvinylpyridine, vinyl-pyridine-alkyl acrylate copolymer, etc.) (Class 508/264)
- Nitrogen attached to the hetero ring directly or indirectly by acyclic nonionic bonding (Class 508/266)
- Chalcogen or nitrogen attached indirectly to the hetero ring by nonionic bonding (Class 508/267)
- Plural hetero atoms in the hetero ring (e.g., pyrazoles, benzimidazoles, etc.) (Class 508/269)
- Plural oxygens double bonded directly to ring carbons of the hetero ring which are adjacent to the ring nitrogen (Class 508/287)
- Polycyclo ring system which contains the hetero ring as one of the cyclos (e.g., indigo, carbazole, phthalocyanine, etc.) (Class 508/296)
- Having a -C(=X)X- group, wherein the Xs are the same or diverse chalcogens, attached directly or indirectly to the hetero ring by acyclic nonionic bonding (e.g., vinylpyrrolidone-acrylate copolymers, etc.) (Class 508/297)