US PATENT SUBCLASS 516 / 81
.~.~.~.~ The material is substantially pure silica sol

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


516 /   HD   COLLOID SYSTEMS AND WETTING AGENTS; SUBCOMBINATIONS THEREOF; PROCESSES OF

9  DF  CONTINUOUS LIQUID OR SUPERCRITICAL PHASE: COLLOID SYSTEMS; COMPOSITIONS CONTAINING AN AGENT FOR MAKING OR STABILIZING COLLOID SYSTEMS; PROCESSES OF MAKING OR STABILIZING COLLOID SYSTEMS; PROCESSES OF PREPARING THE COMPOSITIONS (E.G., THICKENING AGENT; PROTECTIVE COLLOID AGENT; COMPOSITION CONTAINING AN EMULSIFYING AGENT WITH NO DISPERSANT* DISCLOSED; ORGANIC LIQUID EMULSIFIED IN ANHYDROUS HF) {5}
77  DF  .~ Aqueous continuous liquid phase and discontinuous phase primarily solid (e.g., water based suspensions, dispersions, or certain sols*, of natural or synthetic ester-wax, beeswax, carnauba wax; or latex dispersion) {1}
78  DF  .~.~ The solid is primarily inorganic material (e.g., mercurous halide) {4}
79  DF  .~.~.~ The material primarily contains compound containing silicon covalently bonded to oxygen (e.g., aluminum silicate, clay) {2}
81.~.~.~.~ The material is substantially pure silica sol {6}
82  DF  .~.~.~.~.~> The silica is formed or grown by reaction of alkali silicate and non-siliceous inorganic acid (e.g., H2SO4)
83  DF  .~.~.~.~.~> Ion exchange step occurs before or during growing or forming the sol
84  DF  .~.~.~.~.~> Ion-exchange step employed in post-treatment (e.g., purification)
85  DF  .~.~.~.~.~> Gel forming step (e.g., peptize)
86  DF  .~.~.~.~.~> Hydrolysis step or elemental silicon source (e.g., forming fumed silica)
87  DF  .~.~.~.~.~> Having colloid system stabilizing or preserving agent which is organic compound (e.g., deflocculant, antibacterial, esterification of unstable silicasols)

DEFINITION

Classification: 516/81

The material is substantially pure silica sol:

(under subclass 79) Subject matter in which said solid inorganic* material* is substantially pure silica sol.

SEE OR SEARCH THIS CLASS, SUBCLASS:

34, for colloid systems in which the continuous liquid phase is primarily organic* and the discontinuous phase is primarily inorganic* solid or semisolid material* which is primarily compounds containing both silicon and oxygen, both aluminum and oxygen, or combinations thereof, such as silica organosol*, silica alcosol, talc, and clay.

SEE OR SEARCH CLASS

65, Glass Manufacturing,

17.2, for processes of working or treating glass which includes a sol-gel route or liquid phase route procedure during any stage of working or treating glass.

508, Solid Antifriction Devices, Material Therefor, Lubricant or Separant Compositions for Moving Solid Surfaces, and Miscellaneous Mineral Oil Compositions, appropriate subclasses for claimed or solely disclosed lubricants

composed of suspension which may be colloid systems, see 136+, for compositions which are miscellaneous mineral oil compositions, or are lubricants or separants for moving solid surfaces, which contain silicon dioxide, silicic acid, orthosilicate, or metasilicate (e.g., clays, onium clays, estersils, etc.) which may be surface-treated. This class is organized based upon the chemical constituents or chemical reactants of the composition or device; no subclass specifically provides for colloid systems or wetting agents, therefore such subject matter would be placed based upon its constituents as though it were a solution or mixture having no colloid system characteristic.