US PATENT SUBCLASS 44 / 351
.~.~.~ Acyclic chalcogen bonded directly to ring carbon of the hetero ring (e.g., five-membered lactones, anhydrides, sorbitans, 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}
350  DF  .~.~ The hetero ring contains five members including carbon and chalcogen {2}
351.~.~.~ Acyclic chalcogen bonded directly to ring carbon of the hetero ring (e.g., five-membered lactones, anhydrides, sorbitans, etc.)

DEFINITION

Classification: 44/351

Acyclic chalcogen bonded directly to ring carbon of the hetero ring (e.g., five-membered lactones, anhydrides, sorbitans, etc.):

(under subclass 350) Compositions in which ring carbon of the five-membered hetero ring is bonded directly to acyclic chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).

(1) Note. An example of an ingredient provided for herein is the copolymer of ethylene and maleic anhydride.