US PATENT SUBCLASS 204 / 531
.~.~.~.~.~.~ Acid prepared, recovered, or treated

Current as of: June, 1999
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204 /   HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY

*  DD  PROCESSES AND PRODUCTS {7}
450  DF  .~ Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere {14}
518  DF  .~.~ Barrier separation (e.g., using membrane, filter paper, etc.) {5}
520  DF  .~.~.~ Ion selective {8}
522  DF  .~.~.~.~ Using both anion and cation selective membranes {4}
523  DF  .~.~.~.~.~ Alternating anion and cation selective membranes {8}
531.~.~.~.~.~.~ Acid prepared, recovered, or treated

DEFINITION

Classification: 204/531

Acid prepared, recovered, or treated:

(under subclass 523) Process in which an acid is intentionally prepared, recovered, or treated.

(1) Note. This subclass is not intended to provide for the mere use of an acid unless it is also intentionally separated by electrophoresis or electro-osmosis using alternating anion and cation selective membranes.