US PATENT SUBCLASS 523 / 175
.~.~ Liquid-solid drag reduction composition or process of preparing

Current as of: June, 1999
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523 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
1  DF  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF {71}
175.~.~ Liquid-solid drag reduction composition or process of preparing

DEFINITION

Classification: 523/175

Liquid-solid drag reduction composition or process of preparing:

(under subclass 1) Subject matter wherein a composition having utility related to improving drag reduction formations or systems which are effective for reducing the dynamic drag

of turbulent fluid in contact with a surface is claimed or solely disclosed or to processes of preparation thereof.

(1) Note. For an explanation of patent placement referring to claimed or solely disclosed, see (in the class definition) the section of SEARCH THIS CLASS, SUBCLASS that refers to this subclass.

(2) Note. Drag reduction is defined to be the increase in the volumetric flow rate of a fluid at a constant pressure drop due to the addition of a solid polymeric material of relatively high molecular weight. The mere mention of a "drag reduction" composition is sufficient to place a patent in this subclass.

(3) Note. A composition which is not solely disclosed to be useful in drag reduction is placed as appropriate in Classes 523 and 524 hereinbelow.

SEE OR SEARCH CLASS

137, Fluid Handling,

13, for processes of handling fluid materials, including gas and liquids, in which the flow of fluent materials is facilitated by the addition of material to the fluid for the purposes of affecting the flow characteristics of the fluent material. 516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

198+, for wetting agents (e.g., spreading, penetrating, leveling) or methods of making such agents, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.