1. CPC Sections
  2. CPC Section F
  3. CPC Class F04
  4. CPC Subclass F04F
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CPC
COOPERATIVE PATENT CLASSIFICATION
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F04F
PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED {(evacuating by sorption F04B)}; SIPHONS {(conveying materials in bulk by flows of gas, liquid of foam B65G 53/00)} [2018-08]
NOTES

  • Attention is drawn to the notes preceding class F01.
  • Combinations of pumps belonging to this subclass with other pumps are only classified in this subclass if such other pumps are fore pumps of diffusion pumps.
WARNING

  • In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.
F04F 1/00
Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped (using only negative pressure F04F 3/00; jet pumps F04F 5/00; siphons F04F 10/00) [2013-01]
F04F 1/02
.
using both positively and negatively pressurised fluid medium, e.g. alternating [2013-01]
F04F 1/04
. .
generated by vaporising and condensing [2013-01]
F04F 1/06
.
the fluid medium acting on the surface of the liquid to be pumped (F04F 1/02 takes precedence) [2013-01]
F04F 1/08
. .
specially adapted for raising liquids from great depths, e.g. in wells [2017-08]
F04F 1/10
. .
of multiple type, e.g. with two or more units in parallel (F04F 1/08 takes precedence) [2013-01]
F04F 1/12
. . .
in series [2013-01]
F04F 1/14
. .
adapted to pump specific liquids, e.g. corrosive or hot liquids [2013-01]
F04F 1/16
. .
characterised by the fluid medium being suddenly pressurised, e.g. by explosion [2013-01]
F04F 1/18
.
the fluid medium being mixed with, or generated from the liquid to be pumped [2013-01]
F04F 1/20
. .
specially adapted for raising liquids from great depths, e.g. in wells [2013-01]
F04F 3/00
Pumps using negative pressure acting directly on the liquid to be pumped (siphons F04F 10/00) [2013-01]
F04F 5/00
Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow (diffusion pumps F04F 9/00; combination of jet pumps with pumps of other than jet type F04B; use of jet pumps for priming or boosting non-positive-displacement pumps F04D) [2013-01]
F04F 5/02
.
the inducing fluid being liquid [2017-08]
F04F 5/04
. .
displacing elastic fluids [2013-01]
F04F 5/06
. . .
of rotary type [2013-01]
F04F 5/08
. . .
the elastic fluid being entrained in a free falling column of liquid [2013-01]
F04F 5/10
. .
displacing liquids, e.g. containing solids, or liquids and elastic fluids [2013-01]
F04F 5/12
. . .
of multi-stage type [2013-01]
F04F 5/14
.
the inducing fluid being elastic fluid [2013-01]
F04F 5/16
. .
displacing elastic fluids [2013-01]
F04F 5/18
. . .
for compressing [2013-01]
F04F 5/20
. . .
for evacuating [2013-01]
F04F 5/22
. . . .
of multi-stage type [2013-01]
F04F 5/24
. .
displacing liquids, e.g. containing solids, or liquids and elastic fluids [2017-08]
F04F 5/26
. . .
of multi-stage type (F04F 5/28 takes precedence) [2013-01]
F04F 5/28
. . .
Restarting of inducing action [2013-01]
F04F 5/30
. . . .
with axially-slidable combining nozzle [2013-01]
F04F 5/32
. . . .
with hinged flap in combining nozzle [2013-01]
F04F 5/34
. .
characterised by means for changing inducing fluid source [2013-01]
F04F 5/36
. .
characterised by using specific inducing fluid [2013-01]
F04F 5/38
. . .
the inducing fluid being mercury vapour [2013-01]
F04F 5/40
. . .
the inducing fluid being oil vapour [2013-01]
F04F 5/42
.
characterised by the input flow of inducing fluid medium being radial or tangential to output flow (cyclones B04C) [2013-01]
F04F 5/44
.
Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F 5/02 - F04F 5/42 [2016-05]
F04F 5/46
. .
Arrangements of nozzles [2013-01]
F04F 5/461
. . .
{Adjustable nozzles} [2013-01]
F04F 5/462
. . .
{with provisions for cooling the fluid} [2013-01]
F04F 5/463
. . .
{with provisions for mixing} [2013-01]
F04F 5/464
. . .
{with inversion of the direction of flow} [2013-01]
F04F 5/465
. . .
{with supersonic flow (mixing of supersonic fluids B01F 25/20)} [2022-01]
F04F 5/466
. . .
{with a plurality of nozzles arranged in parallel} [2013-01]
F04F 5/467
. . .
{with a plurality of nozzles arranged in series} [2013-01]
F04F 5/468
. . .
{with provisions for priming} [2013-01]
F04F 5/469
. . .
{for steam engines} [2013-01]
F04F 5/48
. .
Control [2013-01]
F04F 5/50
. . .
of compressing pumps [2013-01]
F04F 5/52
. . .
of evacuating pumps [2013-01]
F04F 5/54
.
Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different type [2013-01]
F04F 7/00
Pumps displacing fluids by using inertia thereof, e.g. by generating vibrations therein [2017-08]
F04F 7/02
.
Hydraulic rams [2013-01]
F04F 9/00
Diffusion pumps [2013-01]
F04F 9/02
.
of multi-stage type [2013-01]
F04F 9/04
.
in combination with fore pumps, e.g. use of isolating valves [2013-01]
F04F 9/06
.
Arrangement of vapour traps [2013-01]
F04F 9/08
.
Control [2013-01]
F04F 10/00
Siphons [2013-01]
F04F 10/02
.
Gravity-actuated siphons [2013-01]
F04F 13/00
Pressure exchangers [2013-01]
F04F 99/00
Subject matter not provided for in other groups of this subclass [2013-01]