US PATENT SUBCLASS 44 / 344
.~.~.~.~ Having -C(=X)-, wherein X is chalcogen or NH, attached indirectly to the hetero ring by nonionic bonding

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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}
340  DF  .~.~ The hetero ring contains five members including nitrogen and carbon (e.g., pyrrolidones, porphines, etc.) {4}
342  DF  .~.~.~ Plural nitrogens in the hetero ring (e.g., imidazolines, etc.) {3}
344.~.~.~.~ Having -C(=X)-, wherein X is chalcogen or NH, attached indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 44/344

Having -C(=X)-, wherein X is chalcogen or NH, attached indirectly to the hetero ring by nonionic bonding:

(under subclass 342) Compositions wherein the five-membered hetero ring is attached indirectly, by nonionic bonding, to carbon of a -C(=X)- group, where X is NH or chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).

(1) Note. An example of an ingredient provided for herein is: [figure]