US PATENT SUBCLASS 502 / 233
.~.~ Forming silica gel

Current as of: June, 1999
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502 /   HD   CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING

100  DF  CATALYST OR PRECURSOR THEREFOR {12}
232  DF  .~ Silicon containing or process of making {2}
233.~.~ Forming silica gel {2}
234  DF  .~.~.~> Coprecipitating {2}
237  DF  .~.~.~> Metal, metal oxide, or metal hydroxide containing {2}

DEFINITION

Classification: 502/233

Forming silica gel:

(under subclass 232) Process in which an amorphous form of hydrate silica is produced; generally by precipitation or coagulation of a silica sol or decomposition of a silicate.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8+, for a process of making or treating a sphere which may include formation of a silica gel.

400+, especially 407+ for a sorbent composition in which

silica gel is a constituent.

SEE OR SEARCH CLASS

423, Chemistry of Inorganic Compounds,

335, for silica gel, per se, in the dried state. 516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

34, for colloid systems of colloid-sized silica dispersed in primarily organic continuous liquid phase (organosilica sols), subclasses 79+ for colloid systems of colloid-sized silica dispersed in aqueous continuous liquid phase (aquasilica sols), subclass 111 for colloid systems of continuous or semicontinuous solid phase with discontinuous liquid phase (silica gel); or agents for such systems or making or stabilizing such systems or agents; in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.