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CPC Definition - Subclass F15D

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Last Updated Version: 2016.11
F15D
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 place 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.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Nozzles, spray heads

B05B

Devices to decrease friction or resistance or to increase speed of ships

B63B

Ship rudders

B63H 25/38

Influencing air-flow over aircraft surfaces

B64C 21/00

Influencing the flow or the viscosity of fluids with chemical additives

C09K 3/00, C10M

Hydraulic engineering

E02B

Influencing flow of fluids
Definition statement

This place 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 place covers:

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

media0.png

Fig. from WO2008071683

{Whirl chambers}
Definition statement

This place 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 place covers:

Illustrative example of subject matter classified in this group.

media1.png

Fig. from DE3609541

media2.png

Fig. from EP2103818

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Golf balls having dimples

A63B 37/0004

Influencing air-flow over aircraft surfaces by affecting boundary-layer flow using e.g. riblets

B64C 21/10

Synonyms and Keywords

In patent documents, the following words/expressions are often used as synonyms:

  • "riblet", "rille" (DE), "rippe" (DE) and "rainure" (FR)
  • " boundary layer", "Grenzschicht" (DE)