US PATENT SUBCLASS 508 / 268
.~.~ The hetero ring contains five members including nitrogen and carbon (e.g., polyvinylpyrrolidone, etc.)


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508 /   HD   SOLID ANTI-FRICTION DEVICES, MATERIALS THEREFOR, LUBRICANT OR SEPARATE COMPOSITIONS FOR MOVING SOLID SURFACES, AND MISCELLANEOUS MINERAL OIL COMPOSITIONS

110  DF  LUBRICANTS OR SEPARANTS FOR MOVING SOLID SURFACES AND MISCELLANEOUS MINERAL OIL COMPOSITIONS (E.G., WATER CONTAINING, ETC.) {53}
243  DF  .~ 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) {4}
268.~.~ The hetero ring contains five members including nitrogen and carbon (e.g., polyvinylpyrrolidone, etc.) {4}
269  DF  .~.~.~> Plural hetero atoms in the hetero ring (e.g., pyrazoles, benzimidazoles, etc.) {3}
287  DF  .~.~.~> Plural oxygens double bonded directly to ring carbons of the hetero ring which are adjacent to the ring nitrogen {4}
296  DF  .~.~.~> Polycyclo ring system which contains the hetero ring as one of the cyclos (e.g., indigo, carbazole, phthalocyanine, etc.)
297  DF  .~.~.~> Having a -C(=X)X- group, wherein the X's are the same or diverse chalcogens, attached directly or indirectly to the hetero ring by acyclic nonionic bonding (e.g., vinylpyrrolidone-acrylate copolymers, etc.) {1}


DEFINITION

Classification: 508/268

The hetero ring contains five members including nitrogen and

carbon (e.g., polyvinylpyrrolidone, etc.):

(under subclass 243) Compositions wherein the hetero ring is five-membered with carbon and nitrogen as ring members.

(1) Note. An example of a component provided for herein is the copolymer of N-vinyl pyrrolidone and cetyl vinyl ether.