US PATENT SUBCLASS 44 / 350
.~.~ The hetero ring contains five members including carbon and chalcogen

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}
350.~.~ The hetero ring contains five members including carbon and chalcogen {2}
351  DF  .~.~.~> Acyclic chalcogen bonded directly to ring carbon of the hetero ring (e.g., five-membered lactones, anhydrides, sorbitans, etc.)
352  DF  .~.~.~> Ring carbons of the hetero ring are unsubstituted or hydrocarbyl substituted only

DEFINITION

Classification: 44/350

The hetero ring contains five members including carbon and chalcogen:

(under subclass 329) Compositions which contain a five-membered hetero ring compound with carbon and chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) as the only ring members.

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