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MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME (milk flow sensing devices in milking machines or devices A01J 5/01; measuring or recording blood flow A61B 5/02, A61B 8/06; metering media to the human body A61M 5/168; burettes or pipettes B01L 3/02; arrangements of liquid volume meters or volume-flow meters in liquid-delivering apparatus, e.g. for retail sale purposes, B67D5/16; pumps, fluid motors, details common to measuring or metering devices and pumps or fluid motors F01 to F04; { sampling G01N 1/00} ; locating, determining distance or velocity using reflection or reradiation of radio waves, analogous arrangements using other waves G01S; systems for ratio control G05D 11/00; { coin-freed apparatus for metering flow of liquid or gas G07F 15/00} )
Definition statement
This subclass/group covers:
  • Apparatus or methods for measuring the volume flow or mass flow of fluids or fluent solid materials.
  • Apparatus or methods for metering by volume.
  • Apparatus or methods for measuring the capacity of containers or cavities, or the volume of solid bodies, fluids or fluent solid materials.
  • Level indicators.
  • Details, accessories, testing or calibrating of the apparatus as described.
References relevant to classification in this subclass
This subclass/group does not cover:
Measuring linear dimensions to determine volume
Sampling; Preparing specimens for investigation
Ratio control

Examples of places where the subject matter of this class is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Milk flow sensing devices in milking machines or devices
Food containers with dispensing devices for dispensing a certain quantity of powdered or granulated foodstuffs
Apparatus for making beverages having water-level controls
Measuring blood flow
Metering media introduced into the human body, e.g. drip meters
Controlling the quantity of fluent-solid material fed into a container during packaging by volumetric measurement
Controlling the quantity of plastic material, semi-liquids, liquids, or mixed solids and liquids, fed into a container during packaging by volumetric measurement
Separating measured quantities from supply by volume measurement
Bottling liquids or semi-liquids with provision for metering the liquids to be introduced, e.g. when adding syrups
Flowmeters used in apparatus or devices for dispensing beverages on draught
Arrangements of liquid volume meters or volume-flow meters in liquid-delivering apparatus, e.g. for retail sale purposes
B67D5/16
Measuring liquid level in wells
Indicating devices for lubricant level
Measuring intake air flow to generate a control signal for control of supply of combustible mixture in combustion engines
Proportioning devices in lubricating systems
Arrangements for measuring the quantity of conveyed product in pipe-lines
Adaptation of level indicators to, or mounting on, steam boilers
Controlling water feed or water level for steam generation
Rainfall or precipitation gauges
Apparatus actuated by coins, cards or the like with meter-controlled dispensing of liquid or gas
Reactor-coolant flow measuring or monitoring in nuclear reactors;Moderator- or coolant-level detecting devices in nuclear reactors
Accumulators combined with arrangements for measuring, testing, or indicating condition, e.g. level or density of the electrolyte
Informative references
Attention is drawn to the following places, which may be of interest for search:
Filters
Burettes or pipettes
Weighing a continuous stream of material during flow
Measuring pressure
Measuring speed of fluids, e.g. of air stream
Determining a distance or velocity using sonar, radar or lidar techniques
Control of flow; Control of level
Alarm devices
Electric switches operated by change of liquid level, e.g. float switches, or by a change of fluid flow
Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow (measuring a proportion of the volume flow G01F 5/00; measuring speed of flow G01P 5/00; indicating presence or absence of flow G01P 13/00; regulating quantity or ratio {G05D 7/00, G05D 11/02} )
Definition statement
This subclass/group covers:

Devices specially adapted to be used in open channels

Devices operating

  • by measuring the level variations of storage tanks relative to the time
  • by using mechanical effects
  • by using electric or magnetic effects
  • by measuring frequency, phaseshift, or propagation time of electro-magnetic or other waves, e.g. ultrasonic flowmeters
  • by using thermal effects

Devices using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter Devices for measuring pulsing fluid flows

Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid

Devices for measuring mass flow of a fluid or a fluent solid material

Relationship between large subject matter areas

Although measuring speed of fluids is classified in G01P 5/00, determination of speed of fluids flowing through tubes is considered as belonging to flow measurement and is generally not classified in G01P 5/00, but in G01F, e.g. G01F 1/66, even if volume flow is not explicitly mentioned in the documents.

References relevant to classification in this group
This subclass/group does not cover:
Measuring a proportion of volume flow
Weighing a continuous stream of material during flow
Indicating presence or absence of flow
Informative references
Attention is drawn to the following places, which may be of interest for search:
Fluidic oscillators
Arrangements or constructions of Pitot tubes for measuring speed of fluids
Measuring speed by using correlation means in general
Detection means in general
Magnet, inductances; transformers; selection of materials for their magnetic properties
Special rules of classification within this group

G01F 1/37 and G01F 1/38 take precedence over G01F 1/363 and G01F 1/366.

G01F 1/66 takes precedence over G01F 1/56.

G01F 1/582 takes precedence over G01F 1/586.

G01F 1/58 takes precedence over G01F 1/64.

G01F 1/663, G01F 1/665 and G01F 1/666 take precedence over G01F 1/667.

G01F 1/6847 takes precedence over G01F 1/688.

G01F 1/7082 to G01F 1/7088 take precedence over G01F 1/712.

Devices using Peltier or Seebeck effects are also classified under G01F 1/6888.

Devices for measuring pulsing fluid flow and devices for measuring bidirectional flow are classified in G01F 1/72.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Multiple exciters or detector pairs
Vibrating tube Coriolis mass flowmeters with more than one driver or more than one pair of pick-offs (this group is a subgroup of the previous one but, at present, incomplete)
Special driving or detecting modes
Vibrating tube Coriolis mass flowmeters with special/unusual arrangements of exciters and/or detectors, such as: more than one driver or more than one detector pair; or unusual driving modes
{specially adapted to be used in open channels}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US5684250

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US2002066484

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{by measuring the level variations of storage tanks relative to the time}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

EP2265905

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US4669308

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{Orbital ball flowmeters}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

WO2008044917

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using rotating vanes with tangential admission
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US6079281

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using rotating vanes with axial admission
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

WO2004020894

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EP1992916

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by detection of dynamic effects of the fluid flow
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

WO2006062007

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DE102007057060

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{Jet stream flowmeters}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US3709213

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US3705534

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{Measuring pressure, force or momentum of a fluid flow which is forced to change its direction}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

DE102007000445

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US5687768
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US5571974

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WO9702470
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{using fluidic oscillators (fluidic oscillators per se F15C 1/00) }
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

EP1094303 EP0295845 US4182172

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by measuring the height of the fluid level due to the lifting powder of the fluid flow
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

EP0783056

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GB402685
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by means of chains, flexible bands or wires introduced into and moved by the flow
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

WO9300571

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US4594890

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by measuring electrical current passing through the fluid flow; measuring electrical potential generated by the fluid flow, e.g. by electrochemical, contact or friction effects (G01F 1/58 takes precedence)
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US3742263

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WO2010000977
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{using light}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US3709599

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{Constructional details}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US2007227261

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EP2236993

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{of the drag-type}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

EP1728054

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US2008088819
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{by detecting noise and sounds generated by the flowing fluid}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US2009158858

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{Schematic arrangements of transducers of ultrasonic flowmeters; Circuits therefor (G01F 1/663, G01F 1/665, G01F 1/666 take precedence) }
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US2009138215

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EP2072972

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US2002105340

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{the concentration of electrical loaded particles giving an indication of the flow}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US2005235757

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{using electrical loaded particles as tracers}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

EP1907801

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EP1754957

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Devices for measuring pulsing fluid flows
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

DE102007038474

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GB2447425

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Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

FR2936312

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US7738084

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US2010280757

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Devices for measuring mass flow of a fluid or a fluent solid material (weighing a continuous stream of material during flow G01G 11/00)
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

GB2241789

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{using fluidic bridge circuits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

EP0737302

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operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

WO9702470

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US2007193371

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using a driven wheel as impeller and one or more other wheels or moving elements which are angularly restrained by a resilient member, e.g. spring member as the measuring device
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

GB1087350

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{ details of flowmeter manufacturing methods}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Details of flow meter manufacturing methods:

Methods for designing flow meters, e.g. numerical simulations of flow meter behaviour or modelling to refine the flow meter design (e.g.. eigenvector design): (XP002096659, WO99/28708, US2003097883, EP0271605,WO0165213)

WO0165213:

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{ constructional details}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Constructional details

{ means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Means for influencing the flow meter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments:

Details of tubes, casings or special casings for gyroscopic mass flow meters, e.g. central support manifold fixing the tube(s) ends US5343764:

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improved node plates/brace bars: WO2009123632, US5370002;

stiffening means EP0547455, figs 1,3:

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Casings influencing the vibrational behaviour should go both to G01F 1/8409 and G01F 1/8413

{ motion or vibration balancing means}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Motion or vibration balancing means:

US4957005, US2009145244, EP1001254, US2923154

Rebalancing means (e.g.. masses or actuators) EP0759542; Rebalanced flow meter design;

US2001035055:

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US2002020228:

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{ exciters}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Exciters: constructional details for exciters, FR2316582, EP1719983, WO8505677

{ detectors}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Detectors: constructional details for detectors, e.g. details of the optical detectors US4311054, US2006243066, EP1719983, US2009145244, US2005150311

{ electronic circuits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Electronic circuits: US4311054, US4680974, US5069074, WO8707714

{ signal processing}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Signal processing: e.g. details of neural networks, FFT, matrix operations, analogue and digital filtering: WO0049371, US4680974, WO8505677, US5555190

{ micro-fluidic or miniaturised flowmeters}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Micro-fluidic or miniaturised flow meters: US2005150311 (e.g. capillaries as flow metering tubes)

{ micro-machined flowmeters}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Micro-machined flow meters: US2007151335 (applying chip technology)

{ arrangements of measuring means, e.g., of measuring conduits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Arrangements of measuring means, e.g., of measuring conduits

{ rotating or rotatingly suspended measuring conduits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Rotating or rotatingly suspended measuring conduits: Revolving (continuously rotating) measuring pipe(s)/ flow path(s): (EP0424828, DE4125424) EP0424828:

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DE4125424:

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Rotating fluid guiding part DE20115010U; Oscillating tube being rotatingly suspended (tube connections allowing rotation): (BE681739, US3276257, US3485098); use of a gyroscope: BE681739:

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{ vibrating means being located inside the measuring conduits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Vibrating means being located inside the measuring conduits:

Vibrating elements in flow path: EP0867694:

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Vibrating metal strip in flow path: US4420983 (fig.11):

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Vibrating cylinder in flow path: US4420983 (fig 1):

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{ the measuring conduits' cross-section being deformed during measurement, e.g. by periodically deflecting a portion of the conduits' surface}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

The measuring conduits’ cross-section being deformed during measurement, e.g. by periodically deflecting a portion of the conduits’ surface:

JP6235652 (the cross-section is deformed by the action of the fluid)

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EP0316908 (phase difference between deflection of successive wall sections)

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{ vibrating measuring conduits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Vibrating measuring conduits:

Pipes, flow paths not covered by the sub-classes: e.g. 3-dimensional flow tube configurations not being loops, e.g. US5184518, US4879910; or an out-of-plane bent flow tube (JP4081617) need to be classified under the subclass G01F 1/8468.

US5184518:

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JP4081617:

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{ having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane (G01F 1/8481 takes precedence) }
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Having curved measuring conduits, i.e. whereby the measuring conduits’ curved center line lies within a plane (G01F 1/8481 takes precedence):

Single S: WO8808517;

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single V: US6484591;

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single U: GB2001759 (fig.9):

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bent oscillating tube (on bearings)US3485098:

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References relevant to classification in this group
This subclass/group does not cover:
Having loop-shaped measuring conduits, e.g. the measuring conduits form a loop with a crossing point
{ with multiple measuring conduits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

with multiple curved measuring conduits: 2x triangle in parallel:

US5497666:

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2xS in parallel: JP63314415

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{ having loop-shaped measuring conduits, e.g. the measuring conduits form a loop with a crossing point}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Having loop-shaped measuring conduits, e.g. the measuring conduits form a loop with a crossing point:

Single loop: US5069074

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WO8505677:

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An almost closed omega, even if called a "loop" should be classified in G01F 1/8472 instead.

{ with multiple measuring conduits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

with multiple loop-shaped measuring conduits:

two loops in parallel: WO8505677

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two loops in series: EP0271605:

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{ having straight measuring conduits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

Having straight measuring conduits: single straight tube:

EP0775893:

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US2002020228:

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{ with multiple measuring conduits}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

with multiple measuring conduits:

Two straight tubes in parallel: WO8808517:

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Two straight tubes in series: US7005019:

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Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow (measuring a proportion of the volume flow G01F 5/00)
Definition statement
This subclass/group covers:

Devices

  • With measuring chambers which expand or contract during measurement;
  • with measuring chambers moved during operation;
  • with stationary measuring chambers having constant volume during measurement.

Wet gas-meters.

{sliding-vane meters}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US3683694

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Rotary piston or ring piston meters
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US5495756

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Geared or lobed impeller meters
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US2010307234

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WO0014486
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US4856427

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GB2120728
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Meters with nutating members, e.g. discs
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US5824896

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US4232550

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in stationary cylinders
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US5193389

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involving two or more cylinders
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

GB1356762

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Tilting-trap meters
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

WO2007079942

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on carriers rotated by the weight of the liquid in the measuring chambers
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

GB191220935

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comprising partitioned drums rotating or nutating in a liquid
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

GB2316491

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comprising bells reciprocating in a liquid
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

DE31633

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Measuring a proportion of the volume flow
Definition statement
This subclass/group covers:
  • Flowmeters of any type measuring flow in a by-pass whereby the fluid is flowing simultaneously in both at least one main conduit and a by-pass. The total flow is derived from a known relationship between the section of the by-pass and the section of the main conduit.
  • Details of by-passes including such flowmeters, e.g. their arrangement within or aside of the main conduit
References relevant to classification in this group
This subclass/group does not cover:
Compound flowmeters whereby the fluid is flowing either in a by-pass or in a main conduit depending on the flow rate, in order to provide two or more measuring ranges
Informative references
Attention is drawn to the following places, which may be of interest for search:
Controlling ratio of two or more flows of fluid
Special rules of classification within this group

Details of specific flowmeters classified in G01F 5/00 are also classified in the relevant sub-groups in G01F 1/00 and G01F 3/00.

Details of flowmeters of the pressure or differential pressure type classified in G01F 5/005 are also classified in the relevant groups G01F 1/34 to G01F 1/50

Synonyms and Keywords

In patent documents the following expressions/words "auxiliary, secondary, or sub-passage" and "by-pass" are often used as synonyms.

In patent documents the following expressions/words "primary passage" and "main passage" are often used as synonyms.

Volume-flow measuring devices with two or more measuring ranges; Compound meters
References relevant to classification in this group
This subclass/group does not cover:
Flowmeters adapted for low flow rates, e.g. where flow is allowed to pass through the flowmeter only when it can be measured by a flowmeter having a specific range
Special rules of classification within this group

The following devices are classified in this group:

  • Arrangement of at least two flowmeters each having a different range and operated only at their respective range, e.g. compound meters. Arrangement of flow conduits and valves designed to divert the flow to the meter with the proper range.
  • Modification to flowmeters in order to increase their range, even when there is only a single flowmeter
  • Flowmeters operated simultaneously but each covering a different range

Details of specific flowmeters are also classified in the relevant sub-groups in G01F 1/00 and G01F 3/00.

Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
Definition statement
This subclass/group covers:

Measuring volume flow relative to another variable

  • with electric, electro-mechanic, electronic or mechanic means
  • whereby the other variable is the flight or running time or the speed of a vehicle.
Informative references
Attention is drawn to the following places, which may be of interest for search:
Economical driving
Testing fuel-injection apparatus
Testing of internal combustion engines
Apparatus requiring external operation and adapted at each repeated and indentical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container without regard to weight and to deliver it
Definition statement
This subclass/group covers:

Devices especially adapted for fluent solid material

Details or accessories

Devices operating

  • with measuring chambers which expand or contract during measurement
  • with measuring chambers moved during operation
  • with stationary measuring chambers having constant volume during measurement
References relevant to classification in this group
This subclass/group does not cover:
Forming a predetermined ratio of substances to be mixed by feeding the components in predetermined amounts
Single-unit, i.e. unitary hand-held apparatuses with a pump
B05B11/00P
Bottling liquids with provision for metering the liquid to be introduced using dosing chambers
B07C3/20D
Apparatus for dispensing beverages on draught comprising means for automatically controlling the amount to be dispensed based on volumetric dosing
Devices for dosing additives in the treatment of water, waste water, or sewage
Pumps specially modified to deliver fixed or variable measured quantities
Informative references
Attention is drawn to the following places, which may be of interest for search:
Dough-dividing machines with division boxes in a revolving body with radially-working pistons
Food containers dispensing a certain quantity of powdered or granulated foodstuffs, e.g. sugar
Beverage-making apparatus with dispensing means for adding a measured quantity of ingredients
Dispensers for liquid or pasty soap dispensing dosed volume
Using squeeze bottles or the like for soap
Hand operated grease guns
Air operated grease guns
Peristaltic pumps
Special rules of classification within this group

G01F 11/04 takes precedence over G01F 11/021.

G01F 19/005 takes precedence over G01F 11/025.

G01F 11/34, G01F 11/40 and G01F 11/46 takes precedence over G01F 11/282.

G01F 11/282 and G01F 11/30 to G01F 11/46 take precedence over G01F 11/284.

{for fluent solid material}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

WO2006123228

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{for liquid or semi-liquid}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US4893732

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DE8624916U

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FR2590555

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{with valves}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US4778087

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{where filling of the measuring chamber is effected by squeezing a supply container that is in fluid connection with the measuring chamber and excess fluid is sucked back from the measuring chamber during relaxation of the supply container}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US5884816

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{ squeezing of the supply vessel causing filling of the measuring chamber and backflow from the measuring chamber to the supply vessel being prevented by a check valve (G01F 11/46 take precedence) }
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US5127553

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for liquid or semi-liquid
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US5601212

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for fluent solid material
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US2008099509

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Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups
Definition statement
This subclass/group covers:

Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups

  • for fluent solid material
  • measuring volume in function of time

Taps comprising counting- and recording means

References relevant to classification in this group
This subclass/group does not cover:
Apparatus for weighing a continuous stream of material
Control of flow
Informative references
Attention is drawn to the following places, which may be of interest for search:
Counting mechanisms
Details of, or accessories for, apparatus of the preceding groups insofar as such details or appliances are not adapted to particular types of such apparatus
Definition statement
This subclass/group covers:

Means for regulating or setting the meter for a predetermined quantity

Valves

Devices

  • characterised by the use of a particular material, e.g. anti-corrosive material
  • comprising means to prevent fraud
  • comprising lubricating means

Means for compensating or correcting for variations in pressure, density or temperature

Indicating or recording devices, e.g. for remote indication

Air or gas separators in combination with liquid meters; Liquid separators in combination with gas meters

Means for preventing damage by freezing or excess pressure or insufficient pressure

Cleaning arrangements; Filters

Casings, e.g. of special material

Diaphragms; Bellows; Mountings therefor

Supports or connecting means for meters

References relevant to classification in this group
This subclass/group does not cover:
Details of, or accessories of apparatuses
Informative references
Attention is drawn to the following places, which may be of interest for search:
Details or accessories of dosing devices
Valves
Valves for diaphragm type gas meters
Valves in general
Cleaning arrangements; Filters
Filters in general
Cleaning in general
Diaphragms; Bellows; Mountings therefor
Diaphragm type gas meters characterized by constructional features of membranes
Connecting means e.g. bypass conduits (not electrical connecting means)
Special rules of classification within this group

G01F 15/14 takes precedence over G01F 15/006.

G01F 1/08 and G01F 1/12 take precedence over G01F 15/026.

G01F 15/063 takes precedence over G01F 15/068.

Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies (measuring linear dimensions to determine volume G01B)
Definition statement
This subclass/group covers:

Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies, including by measurement of pressure of gas

References relevant to classification in this group
This subclass/group does not cover:
Measuring linear dimensions to determine volume
Methods or apparatuses for measuring volume of fluids or fluent solid material, not otherwise provided for, e.g. involving measurement of pressure
Informative references
Attention is drawn to the following places, which may be of interest for search:
Detecting, measuring or recording for diagnostic purposes: measuring volume of limbs, e.g. plethysmography
A61B5/103F
Determining well or borehole volumes
Sensing or measuring mail pieces
Calibrated capacity measures for fluids or fluent solid material, e.g. measuring-cups { (powder measuring spoons A61J; burettes, weighing bottles B01L) }
Definition statement
This subclass/group covers:
  • Measuring spoons or scoops
  • Calibrated capacity measures adapted for semi-liquid, e.g. fat or non fluent solid material, e.g. filamentary
Informative references
Attention is drawn to the following places, which may be of interest for search:
Shop or like accessories: hand implements, e.g. grocers' scoops
Drinking vessels or saucers used for table service
Cooking spoons
Spoons for serving ice-cream
Devices for administering medicines orally, e.g. spoons
Burettes, weighing bottles
Weighing apparatus combined with handles of tools or household implements
{Measuring spoons or scoops}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US6125699

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US5347865

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{for semi-liquid, e.g. fat}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US2645127

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{for non fluent solid material, e.g. filamentary}
Definition statement
This subclass/group covers:

Illustrative example of subject matter classified in this group

US5255439

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US4165565

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US4120094

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Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
Definition statement
This subclass/group covers:

Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for, e.g. involving measurement of pressure

References relevant to classification in this group
This subclass/group does not cover:
Indicating or measuring liquid level by measurement of pressure of the liquid
Informative references
Attention is drawn to the following places, which may be of interest for search:
Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
Special rules of classification within this group

Group G01F 22/02 contains apparatuses and methods whereby in order to determine the volume of fluids or fluid solid material in a container, the pressure of the gas above the fluid in the container is measured in order to determine the volume occupied by the gas and deduct the volume occupied by the fluid from this measurement and the known volume of the container.

Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm (in wells E21B 47/04; adaptation to, or mounting on, steam boilers F22B 37/78; level regulation G05D; alarm devices G08B; {for accumulators H01M 10/48} )
Definition statement
This subclass/group covers:

Devices

  • for discrete indicating and measuring
  • with a probe suspended by a wire or thread
  • with a probe suspended by rotatable arms
  • using buoyant probes
  • with a stationary probe, where a liquid specimen is separated from the mean mass and measured
  • with over-flow pipes
  • characterised by the level signal processing means

Devices whereby the level is determined

  • by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
  • by dip members, e.g. dip-sticks
  • by measurement of pressure
  • by measurement of weight, e.g. to determine the level of stored liquefied gas
  • by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
  • by floats

Level indicators mostly detecting and interface between liquid or fluent solid material and a gas above, but also interfaces between different phases, e.g. immiscible liquids superposed in a container.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Monitoring infusion flow anomalies by detecting the amount of infusate remaining
A61M5/188D3
Regulation of liquid level in devices for separation of solid particles from liquid by sedimentation
Arrangement of indicating or measuring devices for the level of molten metal
In continuous casting of metals, controlling or regulating processes or operations for pouring responsive of molten or slag level
In continuous casting of metals, controlling or regulating processes or operations for removing cast stock responsive of molten or slag level
Water level measuring or regulating devices in washing machines
Measuring or locating liquid level in wells
Adaptations to, or mountings on steam boilers of level indicators
Measuring depth of open water, e.g. sea, lake, river, canal
Level control
Level alarms responsive to moisture
Switches operated by float
Switches actuated by a float carrying a magnet
Accumulators combined with arrangements for measuring electrolyte level
Support or mounting means for aerials used in level-measurement devices
Special rules of classification within this group

G01F 23/02 to G01F 23/28 take precedence over G01F 23/0007.

G01F 23/40 takes precedence over G01F 23/0023.

G01F 23/32 takes precedence over G01F 23/003.

G01F 23/30 to G01F 23/76 take precedence over G01F 23/0038.

G01F 23/02 takes precedence over G01F 23/0046.

In group G01F 23/0038 buoyant probes normally occupy a large height in a container and don't move. The force exerted by the liquid on them is detected to determine the level.

G01F 23/0061 includes for example electrical circuits for treating the signal, for example filtering or averaging signals to compensate for sloshing, treating multiple level signals, transmitting the measured level signal, power saving circuits.

G01F 23/0076 and G01F 23/0092 can for example be used for inclination signals in order to compensate the level signal.

Group G01F 23/303 contains mainly mechanical arrangements around the float to prevent errors due to sloshing. Electronic circuits for compensating for sloshing should be classified in G01F 23/303 only if associated with a measurement using a float and should always be classified in G01F 23/0061 or sub groups.

Testing or calibrating apparatus for measuring volume, volume flow or liquid level, or for metering by volume
References relevant to classification in this group
This subclass/group does not cover:
Adjusting, correcting or compensating means for flowmeters using rotating vanes with tangential admission
Adjusting, correcting or compensating means for flowmeters using rotating vanes with axial admission
Correcting or compensating means for flowmeters of the pressure or differential pressure type
Compensating or correcting for variations in velocity of sound in ultrasonic flowmeters
Thermal flowmeters comprising means to store calibration data for flow signal calculation or correction
Informative references
Attention is drawn to the following places, which may be of interest for search:
Testing or calibrating of devices for controlling, indicating, metering or registering quantity or price of liquid transferred by devices for transferring liquid from bulk storage containers into vehicles or into portable containers
Testing or calibrating devices for speedometers for measuring speed of fluids or speed of bodies relative to fluids
Special rules of classification within this group

G01F 25/0015 to G01F 25/0046 take precedence over G01F 25/0053

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