US PATENT SUBCLASS 252 / 188.21
.~.~ Sulfite

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

188.1  DF  REDUCTIVE BLEACHANT, DEOXIDANT, REDUCTANT, OR GENERATIVE {4}
188.2  DF  .~ Sulfur containing reductant, bleachant, deoxidant, or generative {1}
188.21.~.~ Sulfite {1}
188.22  DF  .~.~.~> Hydrosulfite (dithionite) {1}

DEFINITION

Classification: 252/188.21

Sulfite:

(under subclass 188.2) Composition which contains a sulfite, e.g., a dye-reducing aqueous composition comprised of sodium borohydride and sodium sulfite, etc.