US PATENT SUBCLASS 44 / 348
.~.~.~.~ Substituent on the ring nitrogen contains an acyclic -C(=X)- group, wherein X is chalcogen

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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}
347  DF  .~.~.~ Acyclic chalcogen bonded directly to each carbon adjacent to the ring nitrogen (e.g., succinimides, etc.) {1}
348.~.~.~.~ Substituent on the ring nitrogen contains an acyclic -C(=X)- group, wherein X is chalcogen

DEFINITION

Classification: 44/348

Substituent on the ring nitrogen contains an acyclic -C(=X)-) group, wherein X is chalcogen:

(under subclass 347) Compositions in which acyclic -C(=X)-, wherein X is chalcogen (i.e., oxygen, sulfur, selenium, or tellurium), is present in the ring nitrogen substituent.

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