US PATENT SUBCLASS 508 / 528
.~.~.~ Having -C(=X)-, wherein X is chalcogen, attached directly to the nitrogen (e.g., amides, polyureas, 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}
459  DF  .~ Organic -C(=O)O- compound {19}
527  DF  .~.~ Organic nitrogen salt of a carboxylic acid, or an organic nitrogen compound is present {3}
528.~.~.~ Having -C(=X)-, wherein X is chalcogen, attached directly to the nitrogen (e.g., amides, polyureas, etc.)

DEFINITION

Classification: 508/528

Having -C(=X)-, wherein X is chalcogen, attached directly to the nitrogen (e.g., amides, polyureas, etc.):

(under subclass 527) Compositions wherein the nitrogen is attached directly to -C(=X)-, wherein X is chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).