US PATENT SUBCLASS 508 / 228
.~.~.~ The heterocyclic compound reactant has plural chalcogens bonded directly to ring carbons of the hetero ring (e.g., succinimides, anhydrides, 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}
221  DF  .~ Compound of indeterminate structure, prepared by reacting a heterocyclic compound of known structure; a heterocyclic ring is one having as ring members only carbon and at least one hetero atom selected from nitrogen and chalcogen (oxygen, sulfur, selenium, or tellurium) {9}
227  DF  .~.~ An additional reactant contains phosphorus {1}
228.~.~.~ The heterocyclic compound reactant has plural chalcogens bonded directly to ring carbons of the hetero ring (e.g., succinimides, anhydrides, etc.)

DEFINITION

Classification: 508/228

The heterocyclic compound reactant has plural chalcogens bonded directly to ring carbons of the hetero ring (e.g., succinimides, anhydrides, etc.):

(under subclass 227) Compositions wherein plural chalcogens are bonded directly to ring carbons of the hetero ring of the heterocyclic compound reactant.

(1) Note. The most common hetero ring reactants provided for herein are succinimide, succinic anhydride and maleic anhydride.