US PATENT SUBCLASS 44 / 331
.~.~.~ The heterocyclic compound reactant is a dicarboxylic acid anhydride (e.g., reaction product of succinic anhydride with a polyamine, etc.)

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44 /   HD   FUEL AND RELATED COMPOSITIONS

300  DF  LIQUID FUELS (EXCLUDING FUELS THAT ARE EXCLUSIVELY MIXTURES OF LIQUID HYDROCARBONS) {31}
329  DF  .~ Heterocyclic carbon compound containing a hetero ring having chalcogen or nitrogen as the only ring hetero atoms {6}
330  DF  .~.~ Compound of indeterminate structure prepared by reacting a heterocyclic compound of known structure {2}
331.~.~.~ The heterocyclic compound reactant is a dicarboxylic acid anhydride (e.g., reaction product of succinic anhydride with a polyamine, etc.)

DEFINITION

Classification: 44/331

The heterocyclic compound reactant is a dicarboxylic acid anhydride (e.g., reaction product of succinic anhydride with a polyamine, etc.):

(under subclass 330) Compositions which contain a compound of indeterminate structure resulting from the reaction of a cyclic dicarboxylic acid anhydride.