(under subclass 400) Composition in which an inorganic material, usually a metal or silicon oxide in relatively minor amount is distributed in suspension in water, appearing to be solid while the water constitutes as much as 95 to 99% of the mixture.
(1) Note. A true gel is considered a composition, but a completely dried gel is no more than a compound and classifiable in Class 423.
SEE OR SEARCH CLASS
423, Chemistry of Inorganic Compounds, appropriate subclass for a completely dried inorganic gel.
516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,
98+, for colloid systems of continuous or semicontinuous solid phase with discontinuous liquid phase (gels, pastes, flocs, coagulates) or agents for such systems or making or stabilizing such systems or agents, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.
