US PATENT SUBCLASS 44 / 353
.~.~ The hetero ring contains three or four members

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}
353.~.~ The hetero ring contains three or four members

DEFINITION

Classification: 44/353

The hetero ring contains three or four members:

(under subclass 329) Compositions which contain a hetero ring compound with three or four ring members.