WO2009019549A1 - Filter assembly for an espresso coffee machine, and method - Google Patents

Filter assembly for an espresso coffee machine, and method Download PDF

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Publication number
WO2009019549A1
WO2009019549A1 PCT/IB2008/001769 IB2008001769W WO2009019549A1 WO 2009019549 A1 WO2009019549 A1 WO 2009019549A1 IB 2008001769 W IB2008001769 W IB 2008001769W WO 2009019549 A1 WO2009019549 A1 WO 2009019549A1
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WO
WIPO (PCT)
Prior art keywords
piston
spring
filter
pressure
hot water
Prior art date
Application number
PCT/IB2008/001769
Other languages
French (fr)
Inventor
Pak Man Lee
Original Assignee
Tunbow Electrical Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tunbow Electrical Limited filed Critical Tunbow Electrical Limited
Priority to CN2008800171440A priority Critical patent/CN101873818B/en
Publication of WO2009019549A1 publication Critical patent/WO2009019549A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/24—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure
    • A47J31/34—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure
    • A47J31/36—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure with mechanical pressure-producing means
    • A47J31/3604—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure with mechanical pressure-producing means with a mechanism arranged to move the brewing chamber between loading, infusing and ejecting stations
    • A47J31/3609—Loose coffee being employed
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/24—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/24—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure
    • A47J31/34—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure
    • A47J31/36—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure with mechanical pressure-producing means
    • A47J31/3666—Coffee-making apparatus in which hot water is passed through the filter under pressure, i.e. in which the coffee grounds are extracted under pressure with hot water under liquid pressure with mechanical pressure-producing means whereby the loading of the brewing chamber with the brewing material is performed by the user
    • A47J31/3676—Cartridges being employed
    • A47J31/368—Permeable cartridges being employed
    • A47J31/3685—Brewing heads therefor

Definitions

  • This invention relates to espresso coffee machines, and is particularly concerned with ensuring a pre-determined packing density for the ground coffee used in the filter assembly of such machines.
  • Coffee coffee machines are well-known. Briefly, a small volume of ground coffee beans is compressed within a filter assembly, and hot water is forced under pressure through the coffee to produce the espresso drink. It is important to pack the ground coffee beans sufficiently to ensure that the characteristic crema layer is produced; however packing which is too dense results in excessive pressure of hot water and/or slow production of the espresso drink.
  • US-A-5280747 proposes a packing piston for the ground coffee which is actuated by hot water under pressure from the water boiler.
  • the maximum packing force is determined by the pressure of water acting on the piston, and by a spring arrangement which prevents excessive build-up of pressure within the piston assembly. Accordingly this prior art mechanism can avoid over-packing of the ground coffee beans, but is somewhat complex.
  • the invention provides a method and apparatus for achieving this aim.
  • a method of packing ground coffee in a filter mechanism of an espresso coffee machine comprising the steps of: placing a quantity of ground coffee beans in a filter cup, mounting said filter cup on a retreatable support having a predetermined preload, providing a source of water under pressure, providing a piston mechanism responsive to said source, applying said piston mechanism to said cup to compress the ground coffee beans against the resistance of said support, and increasing said pressure until said pre-load is exceeded, thereby allowing said support to retreat.
  • Complete collapse of the support is not necessary provided that the load applied by the piston mechanism to the ground coffee beans cannot exceed a predetermined spring return force. A partial or progressive retreat may be sufficient.
  • the pre-load may occur as the filter apparatus is attached to an espresso machine.
  • Such an arrangement can ensure a sufficient but not over-packing of the ground coffee beans.
  • the method includes the step of applying a resilient load to said support, for example via a coil compression spring, and pre-loading said spring to provide said pre-load.
  • the spring may have a low rate.
  • the method may include adjusting the pre-load of said spring to give optimal results.
  • the invention also provides a method of making espresso coffee comprising the method of packing noted above, and the further steps of: providing said source as hot water, admitting said hot water to the upstream side of said filter cup at or above the pressure at which said support retreats.
  • the method further includes providing a pre-loaded valve to allow the passage of hot water through said filter cup at a pre-determined pressure at or above the pressure at which said support retreats.
  • a filter support apparatus of an espresso coffee machine comprising a filter body having an upright axis, and a filter cup adapted to receive ground coffee beans, and displaceable downwards on said axis against return means.
  • Such apparatus provides a pre-determined degree of compression of ground coffee beans in the filter cup by downwards displacement with respect to the filter body.
  • the return means is preferably a spring, most preferably a coil compression spring having a pre-load equivalent to the desired degree of compression. In other words adequate compression is indicated by the commencement of downward displacement of the filter cup.
  • Ground coffee may be compressed in the filter cup by manual means, but most preferably the apparatus is attached to an espresso coffee machine for automatic compression, by for example a hydraulic piston responsive to water pressure.
  • the filter cup is preferably circular and the piston is close fitting on the internal diameter of the mouth thereof.
  • uncompressed ground coffee beans will be poured into the filter cup and levelled to the rim thereof prior to compression, to ensure consistency.
  • the return means may be adjustable so as to tune the degree of compression appropriate for good espresso coffee at maximum volume delivery rate.
  • the filter cup may further include a restricted outlet in the base thereof so as to ensure a minimum back pressure.
  • said outlet comprises an insert having a single aperture of pre-determined diameter, the insert being preferably located symmetrically in said base.
  • a filter support apparatus is adapted to many variants of espresso coffee machine in which compression of the ground coffee beans is by downwards movement of a piston.
  • the present invention also provides such a machine having a water reservoir, a pump, and a heater operable to deliver hot water under pressure to the filter support apparatus described above.
  • the machine further comprises a hydraulic piston movable against a filter cup under the action of the hot water under pressure, and having a piston return spring.
  • said piston return spring is a coil compression spring
  • said piston includes a conduit therein for the passage of hot water, said conduit being closed by a resiliently biased non-return valve.
  • Said conduit may comprise an upstanding sleeve on said axis from the piston crown and containing said valve therein.
  • the machine may further include a valve to release water pressure upstream of said piston when the desired volume of coffee liquid has been produced, and to switch off the pump and heater.
  • Said valve may be automatic and comprise an electrical solenoid-operated valve actuated by a flow meter upstream of said pump.
  • Fig. 1 is a schematic representation of an espresso coffee machine.
  • Fig. 2 is an enlarged view of the filter holder assembly of Fig. 1 in an initial condition.
  • Fig. 3 is an enlarged view of the filter holder assembly of Fig. I in a second condition.
  • FIG. 4 is an enlarged view of the filter holder assembly of Fig. 1 in a third condition.
  • an espresso coffee machine 21 includes a water tank 16 having an outlet via a flow meter 17 to a pump 18.
  • the pump 18 is operable to increase the pressure of water substantially (for example up to 15 bar) which then passes via a boiler 19 to a filter and brewing assembly 20.
  • a schematic cup 30 is illustrated on a drip tray 22 below the assembly 20.
  • the assembly 20 is shown in Fig. 2 in greater detail, and comprises a housing 31 having an inlet 14 from the boiler, and an outlet 32 to the drip tray 22.
  • the outlet 32 is normally closed by an electrically actuated solenoid valve 1.
  • the housing 31 includes a supporting structure 33 adapted to receive a removable filter assembly 6, which has a rim 34 engageable on a C shaped supporting surface 35.
  • a removable filter assembly 6 which has a rim 34 engageable on a C shaped supporting surface 35.
  • an upturned annular cylinder 36 within which slides an annular piston 4.
  • an inner sleeve 37 Fast with the piston 4 is an inner sleeve 37 which carries a removable spring retainer 2.
  • a coiled compression spring 3 acts between an inner rim of the cylinder 36 and the underside of the retainer 2 to bias the piston 4 inwardly of the cylinder, as viewed, against an end stop provided by the inner lower edge of the cylinder.
  • a non-retum valve 13 which is biased to the closed condition by a coil compression spring 12. In use, as will be explained, water pressure opens the valve 13 to allow hot water to pass through the sleeve to the filter assembly 6.
  • the filter assembly 6 comprises an outer holder 38 and an inner cup-like shell 5 having a plurality of outlets 8 from which liquid coffee can exit in use.
  • the shell 5 is mounted to the holder 38 via a coil compression spring 7, and can move relatively downward in use, as will be explained.
  • a cup-like insert 39 within the shell 5 provides a receptacle for ground coffee beans 11, and the base of the insert 39 includes a restrictor 9 having a small aperture therein through which coffee liquid under pressure may escape to the outlets 8. It will be understood that the restrictor 9 has an influence on the back pressure upstream thereof.
  • the insert 39 is filled with a predetermined quantity of ground coffee and the filter assembly 6 is attached to the housing 31 as illustrated in Fig. 2.
  • the ground coffee beans 11 lie at a distance from the underside of the piston 4.
  • a further increase in water pressure causes the non-return valve 13 to open, as illustrated in Fig. 4, so that hot water can pass through the filter assembly 6 to produce liquid coffee at the outlets 8.
  • the piston 4 ensures adequate compaction, and in conjunction with the restrictor 9 provides liquid coffee with the desired 'crema' layer.
  • the spring 7 begins to collapse, as also illustrated in Fig. 4. In this way further compaction of the ground coffee beans is obviated in a straightforward and effective manner.
  • the non-return valve 13 should open after the spring 7 begins to collapse, but before the spring 7 is fully compressed.
  • the pump When a predetermined volume of water has passed through the flow meter 17, the pump ceases operation, and the solenoid valve 1 opens to relieve pressure above the piston 4. The piston 4 retreats upwardly to permit the filter assembly to be removed and cleaned.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Apparatus For Making Beverages (AREA)

Abstract

A filter assembly (20) for an espresso coffee machine (21) has an attachable filter mechanism (6) comprising a cup (39) for ground coffee beans (11) mounted upon a retreatable spring (7) in a cup holder (38). In use a piston (4) compresses the ground coffee beans (11), for example using hot water under pressure as an actuating medium, and at a predetermined pressure/load the cup (39) retreats within the up holder (38) to prevent over-packing.

Description

Filter Assembly for An Espresso Coffee Machine, and Method
This invention relates to espresso coffee machines, and is particularly concerned with ensuring a pre-determined packing density for the ground coffee used in the filter assembly of such machines.
Espresso coffee machines are well-known. Briefly, a small volume of ground coffee beans is compressed within a filter assembly, and hot water is forced under pressure through the coffee to produce the espresso drink. It is important to pack the ground coffee beans sufficiently to ensure that the characteristic crema layer is produced; however packing which is too dense results in excessive pressure of hot water and/or slow production of the espresso drink.
US-A-5280747 proposes a packing piston for the ground coffee which is actuated by hot water under pressure from the water boiler. The maximum packing force is determined by the pressure of water acting on the piston, and by a spring arrangement which prevents excessive build-up of pressure within the piston assembly. Accordingly this prior art mechanism can avoid over-packing of the ground coffee beans, but is somewhat complex.
What is required is a straightforward and direct method which ensures adequate packing of the ground coffee beans, and avoids overpacking. The invention provides a method and apparatus for achieving this aim.
According to a first aspect of the invention there is provided a method of packing ground coffee in a filter mechanism of an espresso coffee machine, and comprising the steps of: placing a quantity of ground coffee beans in a filter cup, mounting said filter cup on a retreatable support having a predetermined preload, providing a source of water under pressure, providing a piston mechanism responsive to said source, applying said piston mechanism to said cup to compress the ground coffee beans against the resistance of said support, and increasing said pressure until said pre-load is exceeded, thereby allowing said support to retreat.
Complete collapse of the support is not necessary provided that the load applied by the piston mechanism to the ground coffee beans cannot exceed a predetermined spring return force. A partial or progressive retreat may be sufficient.
The pre-load may occur as the filter apparatus is attached to an espresso machine.
Such an arrangement can ensure a sufficient but not over-packing of the ground coffee beans.
In a preferred embodiment the method includes the step of applying a resilient load to said support, for example via a coil compression spring, and pre-loading said spring to provide said pre-load. The spring may have a low rate. The method may include adjusting the pre-load of said spring to give optimal results.
The invention also provides a method of making espresso coffee comprising the method of packing noted above, and the further steps of: providing said source as hot water, admitting said hot water to the upstream side of said filter cup at or above the pressure at which said support retreats.
In a further refinement the method further includes providing a pre-loaded valve to allow the passage of hot water through said filter cup at a pre-determined pressure at or above the pressure at which said support retreats.
According to a second aspect of the invention there is provided a filter support apparatus of an espresso coffee machine, said apparatus comprising a filter body having an upright axis, and a filter cup adapted to receive ground coffee beans, and displaceable downwards on said axis against return means. Such apparatus provides a pre-determined degree of compression of ground coffee beans in the filter cup by downwards displacement with respect to the filter body. In use the return means is preferably a spring, most preferably a coil compression spring having a pre-load equivalent to the desired degree of compression. In other words adequate compression is indicated by the commencement of downward displacement of the filter cup.
Ground coffee may be compressed in the filter cup by manual means, but most preferably the apparatus is attached to an espresso coffee machine for automatic compression, by for example a hydraulic piston responsive to water pressure. The filter cup is preferably circular and the piston is close fitting on the internal diameter of the mouth thereof. Typically uncompressed ground coffee beans will be poured into the filter cup and levelled to the rim thereof prior to compression, to ensure consistency.
The return means may be adjustable so as to tune the degree of compression appropriate for good espresso coffee at maximum volume delivery rate.
The filter cup may further include a restricted outlet in the base thereof so as to ensure a minimum back pressure. In the preferred embodiment said outlet comprises an insert having a single aperture of pre-determined diameter, the insert being preferably located symmetrically in said base.
A filter support apparatus according to the invention is adapted to many variants of espresso coffee machine in which compression of the ground coffee beans is by downwards movement of a piston. The present invention also provides such a machine having a water reservoir, a pump, and a heater operable to deliver hot water under pressure to the filter support apparatus described above. The machine further comprises a hydraulic piston movable against a filter cup under the action of the hot water under pressure, and having a piston return spring. Li the preferred embodiment said piston return spring is a coil compression spring, and said piston includes a conduit therein for the passage of hot water, said conduit being closed by a resiliently biased non-return valve. Said conduit may comprise an upstanding sleeve on said axis from the piston crown and containing said valve therein.
In use, increasing pressure of hot water first causes downward movement of the piston against said return spring to compress ground coffee beans. At a predetermined water pressure, and consequently at a predetermined load, the return means of the filter cup retreats so as to avoid undue compaction of the ground coffee beans. At or just above this pressure, the non-return valve opens to admit hot water to the filter cup.
The machine may further include a valve to release water pressure upstream of said piston when the desired volume of coffee liquid has been produced, and to switch off the pump and heater. Said valve may be automatic and comprise an electrical solenoid-operated valve actuated by a flow meter upstream of said pump.
Other features of the invention will be apparent from the following description of a preferred embodiment illustrated by way of example in the accompanying drawings in which:
Fig. 1 is a schematic representation of an espresso coffee machine.
Fig. 2 is an enlarged view of the filter holder assembly of Fig. 1 in an initial condition.
Fig. 3 is an enlarged view of the filter holder assembly of Fig. I in a second condition.
Fig. 4 is an enlarged view of the filter holder assembly of Fig. 1 in a third condition. With reference to Fig. 1, an espresso coffee machine 21 includes a water tank 16 having an outlet via a flow meter 17 to a pump 18. The pump 18 is operable to increase the pressure of water substantially (for example up to 15 bar) which then passes via a boiler 19 to a filter and brewing assembly 20. A schematic cup 30 is illustrated on a drip tray 22 below the assembly 20.
The assembly 20 is shown in Fig. 2 in greater detail, and comprises a housing 31 having an inlet 14 from the boiler, and an outlet 32 to the drip tray 22. The outlet 32 is normally closed by an electrically actuated solenoid valve 1.
The housing 31 includes a supporting structure 33 adapted to receive a removable filter assembly 6, which has a rim 34 engageable on a C shaped supporting surface 35. The precise arrangement for locating and retaining the assembly 6 is well understood, and need not be further described here.
Within the upper part of the housing 31 as viewed is an upturned annular cylinder 36 within which slides an annular piston 4. Fast with the piston 4 is an inner sleeve 37 which carries a removable spring retainer 2. A coiled compression spring 3 acts between an inner rim of the cylinder 36 and the underside of the retainer 2 to bias the piston 4 inwardly of the cylinder, as viewed, against an end stop provided by the inner lower edge of the cylinder.
Within the sleeve 37 is provided a non-retum valve 13 which is biased to the closed condition by a coil compression spring 12. In use, as will be explained, water pressure opens the valve 13 to allow hot water to pass through the sleeve to the filter assembly 6.
The filter assembly 6 comprises an outer holder 38 and an inner cup-like shell 5 having a plurality of outlets 8 from which liquid coffee can exit in use. The shell 5 is mounted to the holder 38 via a coil compression spring 7, and can move relatively downward in use, as will be explained. A cup-like insert 39 within the shell 5 provides a receptacle for ground coffee beans 11, and the base of the insert 39 includes a restrictor 9 having a small aperture therein through which coffee liquid under pressure may escape to the outlets 8. It will be understood that the restrictor 9 has an influence on the back pressure upstream thereof.
Use of this apparatus to make coffee is as follows:
The insert 39 is filled with a predetermined quantity of ground coffee and the filter assembly 6 is attached to the housing 31 as illustrated in Fig. 2. The ground coffee beans 11 lie at a distance from the underside of the piston 4.
Activation of the pump 18 and boiler 19 causes hot water to be admitted via the inlet 14. The outlet 32 is closed by solenoid valve I, and water pressure increases. As the pre-load of spring 3 is overcome, the piston 4 descends to the position illustrated in Fig. 3, in which the ground coffee beans 11 are compressed. It will be understood that the degree of compaction is a function of a number of parameters, such as water pressure, piston area and the fineness of the ground beans.
At this stage the non-retum valve 13 remains closed, and the spring 7 uncompressed.
A further increase in water pressure causes the non-return valve 13 to open, as illustrated in Fig. 4, so that hot water can pass through the filter assembly 6 to produce liquid coffee at the outlets 8. The piston 4 ensures adequate compaction, and in conjunction with the restrictor 9 provides liquid coffee with the desired 'crema' layer.
Should the back pressure exceed the desired valves at which liquid coffee is made, the spring 7 begins to collapse, as also illustrated in Fig. 4. In this way further compaction of the ground coffee beans is obviated in a straightforward and effective manner. Ideally the non-return valve 13 should open after the spring 7 begins to collapse, but before the spring 7 is fully compressed.
When a predetermined volume of water has passed through the flow meter 17, the pump ceases operation, and the solenoid valve 1 opens to relieve pressure above the piston 4. The piston 4 retreats upwardly to permit the filter assembly to be removed and cleaned.

Claims

Claims
1. A method of packing ground coffee in a filter mechanism of an espresso coffee machine, and comprising the steps of: placing a quantity of ground coffee beans in a filter cup, mounting said filter cup on a retreatable support having a predetermined preload, providing a source of water under pressure, providing a piston mechanism responsive to said source, applying said piston mechanism to said cup to compress the ground coffee beans against the resistance of said support, and increasing said pressure until said pre-load is exceeded, thereby allowing said support to retreat.
2. The method of claim 1 including the step of applying a resilient load to said support and pre-loading said spring to provide said pre-load
3. The method of claim 2 and including the step of adjusting the pre-load of said spring to give optimal results.
4. The method of any of claims 1-3 when used to make espresso coffee, and including the further steps of: providing said source as hot water, and admitting said hot water to the upstream side of said filter cup at or above the pressure at which said support retreats.
5. The method of claim 5 and further including providing a pre-loaded valve to allow the passage of hot water through said filter cup at a pre-determined pressure at or above the pressure at which said support retreats.
6. A filter support apparatus of an espresso coffee machine, said apparatus comprising a filter body having an upright axis, and a filter cup adapted to receive ground coffee beans, and displaceable downwards on said axis against return means.
7. Apparatus according to claim 6 wherein said return means is a spring.
8. Apparatus according to claim 7 wherein said spring is a coil compression spring.
9. Apparatus according to any of claims 6-9 wherein said filter cup includes a restricted outlet in the base.
10. Apparatus according to claim 9 wherein said outlet comprises an insert having a single aperture of pre-determined diameter.
11. Apparatus according to any preceding claim wherein said return means is adjustable so as to set the pre-load thereof.
12. Apparatus according to any of claims 6-11 and further including an espresso coffee machine having a water reservoir, a pump, and a heater operable to deliver hot water under pressure to the filter cup.
13. Apparatus according to claim 12 and further comprising a hydraulic piston movable against a filter cup under the action of the hot water under pressure, and having a piston return spring.
14. Apparatus according to claim 13 wherein said piston return spring is a coil compression spring, and said piston includes a conduit therein for the passage of hot water, said conduit being closed by a resiliently biased non-return valve.
15. Apparatus according to any of claims 12-14 and further including a valve to release water pressure upstream of said piston when the desired volume of coffee liquid has been produced, and means to switch off the pump and heater.
PCT/IB2008/001769 2007-08-09 2008-07-07 Filter assembly for an espresso coffee machine, and method WO2009019549A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008800171440A CN101873818B (en) 2007-08-09 2008-07-07 Filter assembly for an espresso coffee machine, and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0715592A GB2451692A (en) 2007-08-09 2007-08-09 Filter assembly for an espresso coffee machine
GB0715592.2 2007-08-09

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WO2009019549A1 true WO2009019549A1 (en) 2009-02-12

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GB (1) GB2451692A (en)
WO (1) WO2009019549A1 (en)

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WO2012062223A1 (en) * 2010-09-26 2012-05-18 广东新宝电器股份有限公司 Coffee maker funnel
CN102711569A (en) * 2010-03-08 2012-10-03 松下电器产业株式会社 Coffee maker

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IT1402180B1 (en) * 2010-09-09 2013-08-28 Sgl Italia S R L Con Unico Socio INFUSER GROUP FOR THE PRODUCTION OF A BEVERAGE
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ITBO20120554A1 (en) * 2012-10-11 2014-04-12 Flytek S R L DISPENSER GROUP FOR ESPRESSO COFFEE MACHINES
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Publication number Priority date Publication date Assignee Title
CN102711569A (en) * 2010-03-08 2012-10-03 松下电器产业株式会社 Coffee maker
CN102711569B (en) * 2010-03-08 2015-01-14 松下电器产业株式会社 Coffee maker
WO2012062223A1 (en) * 2010-09-26 2012-05-18 广东新宝电器股份有限公司 Coffee maker funnel

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CN101873818B (en) 2012-05-30
GB0715592D0 (en) 2007-09-19
GB2451692A (en) 2009-02-11
CN101873818A (en) 2010-10-27

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