US PATENT SUBCLASS 508 / 243
.~ 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)

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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.~ 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}
244  DF  .~.~> The hetero ring contains six members including nitrogen and carbon (e.g., pyridine, picoline salts, etc.) {7}
268  DF  .~.~> The hetero ring contains five members including nitrogen and carbon (e.g., polyvinylpyrrolidone, etc.) {4}
299  DF  .~.~> Sulfur-containing hetero ring {3}
304  DF  .~.~> Oxygen-containing hetero ring (e.g., allyl glycidyl ether, etc.) {2}

DEFINITION

Classification: 508/243

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):

(under subclass 110) Compositions which contain a compound having a hetero ring whose members are carbon and at least one hetero atom selected from nitrogen and chalcogen (i.e. oxygen, sulfur, selenium, or tellurium).

(1) Note. Examples of components provided for herein are heterocyclic compounds having more than six or fewer than five ring atoms in the hetero ring, and having only carbon and nitrogen as ring members.