US PATENT SUBCLASS 516 / 39
.~.~ The agent is formed in situ from native precursor by adding inorganic alkaline material (e.g., NaOH or TSP added to in situ acid)

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}
38  DF  .~ Aqueous continuous liquid phase and discontinuous phase primarily bituminous (e.g., asphalt, pitch, tar, montan wax, paraffin wax), or coal, or elemental Carbon {6}
39.~.~ The agent is formed in situ from native precursor by adding inorganic alkaline material (e.g., NaOH or TSP added to in situ acid)

DEFINITION

Classification: 516/39

The agent is formed in situ from native precursor by adding inorganic alkaline material (e.g., NaOH or TSP added to in situ acid):

(under subclass 38) Subject matter in which the colloid system contains a colloid system making or stabilizing agent*, which is formed in situ from at least one native precursor by adding inorganic* alkaline material* to the colloid system or a precursor of it, such as adding NaOH or TSP (trisodium phosphate) to a natively present acid.

(1) Note. "Native precursor" means a precursor or reactant which is present in the starting material* as derived, as contrasted with a precursor or reactant which is added. Thus, impurities of crude oil are native to the oil, and the use of one or more of them by causing reaction with an added inorganic alkaline material* to form a product which is an agent* for making or stabilizing a colloid system (e.g., oil-in-water) is proper for placement in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

18+, for a similar colloid system making or stabilizing agent* used in foam colloid system.

20, for a similar colloid system making or stabilizing agent* used in organic* liquid continuous phase with organic* liquid discontinuous phase (e.g., oil-in-oil emulsion).

28+, for a similar colloid system making or stabilizing agent* used in organic* liquid continuous phase with inorganic* liquid discontinuous phase (e.g., water-in-oil emulsion).

31+, for a similar colloid system making or stabilizing agent* used in organic* liquid continuous phase with discontinuous phase primarily solid or semisolid. 46+, for colloid systems with agents* of similar chemical structure which are not formed in situ from native precursor (e.g., formed from added, nonbituminous source (non-native) organic* compound containing carboxyl, ester, or hydroxy group, reacted with an inorganic* alkaline agent).

72+, for a similar colloid system making or stabilizing agent* used in aqueous continuous phase with discontinuous phase primarily organic* liquid (e.g., oil-in-water emulsion).

77+, for a similar colloid system making or stabilizing agent* used in aqueous continuous phase with discontinuous phase primarily (nonbituminous) solid.

927, for a collection of art which discloses an operation or a step of an in situ formation of colloid system making or stabilizing agent* which includes a chemical reaction.