US PATENT SUBCLASS 508 / 232
.~.~ The heterocyclic compound reactant contains a carboxylic acid anhydride ring


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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}
232.~.~ The heterocyclic compound reactant contains a carboxylic acid anhydride ring {7}
233  DF  .~.~.~> An additional reactant is an alkadiene polymer {1}
235  DF  .~.~.~> An additional olefinic reactant is copolymerized with an unsaturated carboxylic acid anhydride so that the anhydride moiety forms part of the polymer backbone (i.e., addition polymerization)
236  DF  .~.~.~> An additional reactant is a sulfur compound
237  DF  .~.~.~> With organic phosphorus compound
238  DF  .~.~.~> An additional reactant is a polyoxyalkylene compound
239  DF  .~.~.~> An additional reactant is a hydroxylamine or an alcoholic or phenolic hydroxy compound {1}
241  DF  .~.~.~> An additional reactant is a copolymer having ethylene and acyclic olefin monomers (e.g., ethylene-alpha olefin copolymer or ethylene-butylene- -styrene terpolymer grafted with maleic anhydride, etc.)


DEFINITION

Classification: 508/232

The heterocyclic compound reactant contains a carboxylic acid anhydride ring:

(under subclass 221) Compositions wherein a carboxylic acid anhydride ring is present in the heterocyclic compound reactant.

(1) Note. A carboxylic acid anhydride ring, for purposes of this subclass, is characterized by the presence of a -C(=O)-O-C(=O)- group as part of the ring structure.

(2) Note. Maleic anhydride and succinic anhydride are the

two most common carboxylic acid anhydride reactants provided for herein.