US PATENT SUBCLASS 44 / 333
.~.~ The hetero ring contains six members including nitrogen and carbon

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}
333.~.~ The hetero ring contains six members including nitrogen and carbon {5}
334  DF  .~.~.~> Chalcogen in the hetero ring
335  DF  .~.~.~> Plural nitrogens in the hetero ring (e.g., piperazines, etc.) {1}
337  DF  .~.~.~> Polymer or copolymer of a vinyl pyridine
338  DF  .~.~.~> Acyclic chalcogen or acyclic nitrogen bonded directly to ring carbon of the hetero ring
339  DF  .~.~.~> The hetero ring is unsubstituted or hydrocarbyl substituted only, or salts thereof (e.g., pyridyl salicylate salts, isoquinoline, etc.)

DEFINITION

Classification: 44/333

The hetero ring contains six members including nitrogen and carbon:

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

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