US PATENT SUBCLASS 429 / 337
.~.~.~.~ Oxygen is the only ring hetero atom in the hetero ring (e.g., dioxolane, gamma butyrolactone, etc.)

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429 /   HD   CHEMISTRY: ELECTRICAL CURRENT PRODUCING APPARATUS, PRODUCT, AND PROCESS

122  DF  CURRENT PRODUCING CELL, ELEMENTS, SUBCOMBINATIONS AND COMPOSITIONS FOR USE THEREWITH AND ADJUNCTS {16}
188  DF  .~ Include electrolyte chemically specified and method {11}
324  DF  .~.~ Chemically specified organic solvent containing {6}
336  DF  .~.~.~ Hetero ring in the organic solvent {1}
337.~.~.~.~ Oxygen is the only ring hetero atom in the hetero ring (e.g., dioxolane, gamma butyrolactone, etc.) {1}
338  DF  .~.~.~.~.~> The hetero ring is a cyclic carbonate (e.g., ethylene carbonate, propylene carbonate, etc.)

DEFINITION

Classification: 429/337

Oxygen is the only ring hetero atom in the hetero ring (e.g., dioxolane, gamma butyrolactone, etc.):

(under subclass 336) Subject matter wherein the hetero ring contains oxygen as the only ring hetero atom (e.g., butyrolactone, tetrahydrofuran, dioxolane, etc.).