US PATENT SUBCLASS 44 / 340
.~.~ The hetero ring contains five members including nitrogen and carbon (e.g., pyrrolidones, porphines, etc.)

Current as of: June, 1999
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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.~.~ The hetero ring contains five members including nitrogen and carbon (e.g., pyrrolidones, porphines, etc.) {4}
341  DF  .~.~.~> Chalcogen in the hetero ring
342  DF  .~.~.~> Plural nitrogens in the hetero ring (e.g., imidazolines, etc.) {3}
346  DF  .~.~.~> Polymeric or copolymeric compound having plural occurrences of the hetero ring (e.g., alpha-olefin maleimide copolymers, etc.)
347  DF  .~.~.~> Acyclic chalcogen bonded directly to each carbon adjacent to the ring nitrogen (e.g., succinimides, etc.) {1}

DEFINITION

Classification: 44/340

The hetero ring contains five members including nitrogen and carbon (e.g., pyrrolidones, porphines, etc.):

(under subclass 329) Compositions which contain a five-membered hetero ring compound with carbon and nitrogen ring members.

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