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FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS ( { nozzles, spray heads B05B; devices to decrease friction or resistance or to increase speed of ships B63B; ship rudders B63H 25/38; influencing the flow or the viscosity of fluids with chemical additives C09K 3/00, C10M; hydraulic engineering E02B} ; fluid circuit elements F15C; { one-way check valves F16K 15/00} )
Definition statement
This subclass/group covers:

Means and methods not provided for in other classes, for influencing the flow of fluids relative to constraining surfaces and after leaving these surfaces, e.g. producing or removing turbulence, deflecting jets, guiding flow through bends in conduits, affecting distribution of fluid in a conduit, reducing fluid friction.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Nozzles, spray heads
Devices to decrease friction or resistance or to increase speed of ships
Ship rudders
Influencing air-flow over aircraft surfaces
Influencing the flow or the viscosity of fluids with chemical additives
Hydraulic engineering
Influencing flow of fluids
Definition statement
This subclass/group covers:

Means and methods not provided for in other classes, for influencing the flow of fluids, i.e. the flow of liquids or gases relative to constraining surfaces and after leaving these surfaces, e.g. producing or removing turbulence, deflecting jets, guiding flow through bends in conduits, affecting distribution of fluid in a conduit, reducing fluid friction.

{Flow of fluid from conduits such as pipes, sleeves, tubes, with equal distribution of fluid flow over the evacuation surface}
Definition statement
This subclass/group covers:

Means for equalising the velocity distribution across the cross section of a fluid conduit.

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Fig. from WO2008071683

{Whirl chambers}
Definition statement
This subclass/group covers:

E.g. vortex valves

by influencing the boundary layer { (use of materials, e.g. to reduce surface friction C09K 3/00) }
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group.

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Fig. from DE3609541

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Fig. from EP2103818

Informative references
Attention is drawn to the following places, which may be of interest for search:
Golf balls having dimples
Influencing air-flow over aircraft surfaces by affecting boundary-layer flow using e.g. riblets
Synonyms and Keywords

In patent documents the following words "riblet", "rille" (DE), "rippe" (DE) and "rainure" (FR) are often used as synonyms.

In patent documents the following words " boundary layer", "Grenzschicht" (DE) are often used as synonyms.

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013