US PATENT SUBCLASS 44 / 341
.~.~.~ Chalcogen in the hetero ring

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  DF  .~.~ The hetero ring contains five members including nitrogen and carbon (e.g., pyrrolidones, porphines, etc.) {4}
341.~.~.~ Chalcogen in the hetero ring

DEFINITION

Classification: 44/341

Chalcogen in the hetero ring:

(under subclass 340) Compositions wherein the five-membered hetero ring has chalcogen (i.e. oxygen, sulfur, selenium, or tellurium) as a ring member.

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