US PATENT SUBCLASS 252 / 175
WATER-SOFTENING OR PURIFYING OR SCALE-INHIBITING AGENTS

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

175WATER-SOFTENING OR PURIFYING OR SCALE-INHIBITING AGENTS {4}
176  DF  .~> Packages or heterogeneous arrangements
178  DF  .~> Deoxidant or free-metal containing
179  DF  .~> Water-insoluble base-exchange agent containing
180  DF  .~> Plant or organic material containing {1}

DEFINITION

Classification: 252/175

(under the class definition) Compositions specialized and designed for, or peculiar to, use in treating water to soften or purify it, to precipitate impurities in it, or to inhibit formation of scale or incrustation in steam boilers or other water containers, or processes of making such compositions.

SEE OR SEARCH THIS CLASS, SUBCLASS:

387+, for corrosion inhibiting agents.

SEE OR SEARCH CLASS

210, Liquid Purification or Separation,

660+, for processes of separation involving ion exchange or sorption, and subclasses 702+ for separating processes involving precipitation.

423, Chemistry of Inorganic Compounds, 324+, for inorganic silicates.

424, Drug, Bio-Affecting and Body Treating Compositions, appropriate subclass for a biocidal composition which is intended to sterilize water.

510, Cleaning Compositions for Solid Surfaces, Auxiliary Compositions Therefor, or Processes of Preparing the Compositions,

247+, for water scale removing compositions.

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

113+, for compositions for or subcombination compositions for or breaking of or inhibiting of colloid systems (e.g., foam breaking, emulsion breaking, dispersion inhibiting, suspension settling, gel breaking, smoke suppressing, coagulating, flocculating), when generically claimed or when there is no hierarchically superior provision in the USPC for

the specifically claimed art.