EP2207963A2 - Pumpe, pumpenanordnung und pumpenmodul - Google Patents
Pumpe, pumpenanordnung und pumpenmodulInfo
- Publication number
- EP2207963A2 EP2207963A2 EP08842526A EP08842526A EP2207963A2 EP 2207963 A2 EP2207963 A2 EP 2207963A2 EP 08842526 A EP08842526 A EP 08842526A EP 08842526 A EP08842526 A EP 08842526A EP 2207963 A2 EP2207963 A2 EP 2207963A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pumping
- membrane
- pump
- check valve
- pumping membrane
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
- F04B43/043—Micropumps
- F04B43/046—Micropumps with piezoelectric drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
- F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/1037—Flap valves
- F04B53/1047—Flap valves the valve being formed by one or more flexible elements
Definitions
- Embodiments of the present invention are concerned with a pump, a pump assembly, and a pump module, and more particularly, a pump, a pump assembly, and a pump module that operate using a pumping membrane and that are microstructured.
- Known compressors for pressure ranges above 10 bar are typically 1- or 2-stage piston-cylinder systems with a powerful electric motor and a construction volume that is too large for microsystems.
- Small compressors with a volume of less than 1 dm 3 are usually diaphragm pumps with electric drive.
- maximum pressure ranges up to 2 bar are specified.
- micro-membrane pumps with passive check valves, which have a construction space of only a few cm 3 .
- An exemplary micro-membrane pump is known from DE 19719862 Al. This micro-membrane pump comprises a pumping membrane, which is movable by means of a drive device into a first and a second position. A pump body is connected to the pumping membrane to define a pumping chamber therebetween. An inlet opening and an outlet opening are each provided with passive check valves.
- micromembrane pumps only achieve delivery rates of 0.02 l / min for water and 0.05 l / min with air, and the achievable pressures of micromembrane pumps are relatively small, with maximum backpressure (with compressible gas as the delivery volume) of about 400 hPa.
- the present invention provides a pump having the following features:
- a pumping membrane having an opening provided with a passive check valve through the pumping membrane
- an actuator configured to move the pumping membrane between a first position and a second position
- the passive check valve is designed such that a movement from the first position toward the second position acts closing and a movement from the second position toward the first position acts to open, so that a pumping cycle in which the pumping membrane is moved from the first to the second position and back, causes a net flow from the inlet opening to the outlet opening.
- the present invention provides a pump assembly in which a plurality of such pumps are fluidly connected in series.
- the present invention provides a pump module having the following features:
- Embodiments of the present invention are based on the finding that by using a pumping membrane having a passageway therethrough provided with a passive check valve, small diameter pumps with high delivery rates can be implemented at both high and low pressures.
- Embodiments of the present invention may be directed to micro pumps or micromembrane pumps, which are understood here to mean diaphragm pumps whose displacement is in the microliter range or below.
- the stroke volume may be in a range from 200 ⁇ l to 200 ⁇ l.
- Embodiments of the invention provide micropumps whose delivery rate may be several liters per minute, both at high pressures and at small pressures that can be delivered by the pump.
- the inlet port and the outlet port are formed in a pumping chamber with the pumping diaphragm disposed in the pumping chamber and separating it into an inlet side and an outlet side region, with the passive check valve disposed between the inlet side region and the outlet side region is, and being in the first position, the volume of the outlet side portion of the pumping chamber is greater than in the second position.
- Embodiments of the present invention include two pumping diaphragms having ports provided with check valves and respective actuators therefor. Between the pumping membranes, a spacer may be provided which defines a pumping chamber together with the pumping membranes. The outlet opening may be formed through the opening in the one pumping membrane, while the inlet opening may be formed through the openings of the other pumping membranes.
- the actuating devices can be designed to move the pumping membranes such that in a suction phase the volume of the pumping chamber is increased and in a pumping phase the volume of the pumping chamber is reduced.
- the movement of the pumping diaphragms may be closing on one of the check valves and opening on the other, while in the pumping phase the movement of the pumping diaphragms may open on one of the check valves and on the other of the check valves.
- Embodiments of the present invention allow the implementation of high delivery rate micropumps at different pressures.
- Embodiments of the invention may enable the implementation of micropumps having a pressure of 16 to 25 bar (16 x 10 3 to 25 x 10 3 hPa) delivered by them at a delivery rate of at least 0.5 liters per minute.
- Such micro-pumps can, for example, enable the realization of an oil-free microcompressor, for example for use in a Bernoullie / Joule-Thompson cooler.
- the pump may be a piezoelectric micromembrane pump in which the actuator is a piezo ceramic formed on the pumping membrane.
- the micromembrane can have a circular circumference, wherein the piezoceramic can be arranged in a ring around a centrally formed, provided with a passive check valve passage opening.
- the pressure achievable with piezoelectric micromembrane pumps depends on the compression ratio, the valve tightness and the pressure ratio between the top and bottom of the pumping membrane.
- Exemplary embodiments of the invention make it possible to achieve high pressures with the aid of piezoelectric diaphragm pumps without requiring a series connection of a plurality of pumps with separate fluid connections.
- a series connection of several pumps is basically possible if the pump diaphragm for pressure equalization between the pump inlet and the membrane top, i. Pump outlet is provided.
- the maximum possible pressure of the entire system can be determined by the sum of the maximum pressures of the individual pump modules.
- a series connection of micropumps can be disadvantageous because, firstly, the fluid management between the pumps by hose connector or the like is expensive.
- such also encounters technological limitations, since, when a higher pressure is reached, the pumping membrane on the drive side sees the ambient pressure, i. the same is exposed, whereby the Aktorikiki must be oversized.
- FIG. 1 is a schematic cross-sectional view of an embodiment of a pump module according to the invention
- Fig. 2 is a schematic cross-sectional view of an embodiment of a pump according to the invention
- FIG. 3 shows a schematic cross-sectional view of a check valve chip
- FIG. 4 shows a schematic cross-sectional view of an embodiment of a pump according to the invention
- FIG. 5 shows a schematic cross-sectional view of an embodiment of a pump according to the invention
- FIG. 6 is a schematic cross-sectional view of a series connection of three pumps according to FIG. 5.
- the pump module comprises a pumping membrane 10, a passage opening 12, which is provided with a passive check valve 14, and a piezoceramic 16, which is mounted on the pumping membrane 10.
- the pumping membrane 10 may, for example, have a circular circumference in plan view, wherein the passage opening 12 may be centrally arranged with the passive check valve 14.
- the piezoceramic 16 can then surround the passage opening 12 in an annular manner.
- a control device 20 is shown in dashed lines in Fig. 1, which may be formed to apply via corresponding electrical connections 22a and 22b, a voltage difference to the piezoceramic 16 to effect actuation of the pumping membrane.
- the control device 20 may, for example, be a te voltage source have.
- the control device 20 may be designed to apply a periodic voltage to the piezoceramic, for example a pulsed square-wave voltage having a suitable frequency and a suitable duty cycle (of, for example, 1: 1).
- the pumping membrane may be a metallic pumping membrane, which may be made of spring stainless steel, for example.
- the control device 20 may be designed to apply an electrical voltage between the metallic pumping membrane 10 and an electrode arranged on the upper side of the piezoceramic 16.
- the pumping membrane 10 made of a non-conductive material, such as silicon, consist, in which case corresponding conductive structures for applying the voltage to the piezoceramic 16 may be provided.
- the passive check valve 14 may be integrated, for example, of silicon, wherein a check valve chip with a corresponding passive check valve 14 may be mounted in the passage opening 12.
- micro valves made of other suitable materials, such as e.g. Plastic or metal, to be considered.
- FIG. 3 An exemplary embodiment of a check valve chip with a passive check valve 14 is shown in Fig. 3.
- a passive check valve may for example correspond to a passive check valve, as described in DE 19719862 Al.
- the check valve chip has two silicon wafers 24 and 26, which are connected to one another at a connection surface 28, for example by wafer bonding or gluing.
- the passive check valve 14 comprises a valve flap 30, which is structured in the silicon wafer 26, and a valve seat 32, which is structured in the silicon wafer 24.
- the valve seat 32 provides a support surface or support webs for the valve flap 30. Generally sets the width the support webs and the distance between the valve flap and the support webs in the open state, the flow resistance of the check valve firmly.
- the check valve shown in Fig. 3 opens when on the side of the silicon wafer 24, an overpressure compared with a pressure on the side of the silicon wafer 26 prevails. In the other case, a closing force acts on the check valve 14.
- the check valve module or valve may be attached to the pumping membrane 10 in any suitable manner to provide a check valve for the port 12.
- a corresponding non-return valve chip may be glued into the passage opening or glued to the pump diaphragm above or below the passage opening.
- Embodiments of a pump module according to the invention have a very simple structure and can be used to implement both pumps with high achievable pressures and low achievable pressures.
- FIG. 2 A schematic cross-sectional view of an embodiment of a pump according to the invention is shown in FIG. 2.
- the pumping module shown in FIG. 1 is arranged in a pumping chamber in that the pumping membrane 10 is connected at its circumference to housing parts 40 and 42.
- the pumping membrane 10 is circumferentially clamped by the housing parts 40 and 42.
- an inlet opening 44 is formed, while in the housing part 42 an outlet opening 46 is formed.
- the pumping chamber is closed in a fluid-tight manner.
- the piezoceramic 16 constitutes an actuating device for the pumping membrane, wherein again a control device (not shown in FIG Apply actuating voltage to the piezoceramic.
- the pumping membrane and the piezoceramic can represent a piezo-ceramic bending transducer.
- the pump diaphragm Upon application of an actuation voltage to the piezoceramic 16, starting from the state shown in FIG. 2, the pump diaphragm is deflected downwards due to the deformation of the piezoceramic caused by the actuation voltage. This reduces the volume of an inlet-side pumping chamber area defined by the pumping membrane and the housing part 40, while the volume of an outlet-side pumping chamber area 50 defined by the housing part 42 and the pumping membrane 10 increases. This movement acts to open the check valve so that fluid flows from the inlet side pump chamber portion 48 into the outlet side pump chamber portion 50. Subsequently, the voltage applied to the piezoceramic 16 voltage is turned off, so that the pumping membrane returns to the position shown in Fig. 2.
- the membrane is laid down starting from the position shown in FIG. 2 and then returned to the position shown in FIG. 2.
- a square-wave voltage pulse can be applied to the piezoceramic 16.
- the flow resistance through the check valve is less than the flow resistance through the inlet opening.
- the housing parts are designed such that the compression volume, i. the dead volume in the housing is small. This can be achieved, for example, by the contour of the pumping membrane 10 opposite housing parts are adapted to the contour of the pumping membrane in the deflected state.
- FIG. 1 Another embodiment of a pump according to the invention is shown in FIG. 1
- the embodiment shown in FIG. 4 comprises, in addition to the example shown in FIG. 2, a check valve 60 at the pump inlet 44.
- the check valve 60 is designed such that a movement of the pump membrane 10 from the position shown in FIG. 4 into a housing part 40 toward deflected position closing on the check valve 60 acts. As a result, it can be effectively prevented that during this movement fluid is forced through the inlet opening 44 counter to the actual pumping direction, since the check valve 60 prevents such reflux.
- the check valve 60 at the inlet port allows for an increase in the efficiency of the pump.
- the check valve 60 can be implemented in any way, for example ter using a check valve chip, as shown in Fig. 3.
- the exemplary embodiment shown in FIG. 5 has a first pump module 100 and a second pump module 102, which are connected to one another via a spacer 104.
- the pumping modules 100 and 102 may have a structure corresponding to the construction described above with reference to FIG. 1, wherein the respective elements of the first pumping module are respectively marked with the suffix "a ⁇ , while the corresponding elements of the second pumping module 102 are marked with the suffix "b".
- the pumping membranes 10a and 10b are mounted circumferentially on the spacer 104 so that the two pumping membranes 10a and 10b and the spacer 104 define a pumping chamber 106.
- a portion 104a of the spacer 104 extends inwardly between the pumping membranes 10a and 10b.
- the contour of the inwardly extending portion 104a of the spacer 104 is adapted to the contour of the pumping membranes 10a and 10b in the deflected state, so that the dead volume can be reduced and, ideally, can approach zero.
- the pumping membrane 10a Upon application of a corresponding actuation voltage, the pumping membrane 10a is lowered from the position shown in FIG. 5, ie, to the portions 104a of the spacer 104 deflected, and the pumping diaphragm 10b is deflected upon application of a corresponding actuation voltage to the piezoelectric chip 16b upwards, ie to the portion 104a of the spacer 104 out.
- the application of an actuation voltage to the piezoceramic 16a and 16b reduces the volume of the pump chambers 106.
- the pumping membranes 10a and 10b return to the position shown in Fig. 5, whereby the volume of the pumping chamber is increased again.
- the movement of the pumping membrane 10a and 10b to increase the volume of the pumping chamber may be referred to as a suction stroke, while the movement of the pumping diaphragm to reduce the pumping chamber volume may be referred to as a pressure stroke.
- the check valve 14a is designed such that a movement during the pressure stroke opens, while a movement during the suction stroke acts to close.
- the check valve 14b is designed such that a movement during the compression stroke is closing and a movement during the suction stroke is opening.
- the pumping membranes may be made of spring stainless steel.
- the pumping membranes can each have centrally in the middle thereof an opening into which a check valve unit can be integrated.
- the pumping membranes can have a circular circumference , wherein a piezoelectric ceramic can be glued annularly around the passage openings.
- check valves may thus be integrated into the pump membrane or into the pump diaphragms, for example micro-system-manufactured passive check valves made of silicon may be integrated.
- the inlet and outlet of the non-return valves are respectively located on the top and bottom of the pumping membranes, so that media transport through the pumping membrane takes place from the underside to the top of the membrane.
- the integrated in the membrane passive check valve (or the valves) is located where the largest deflection of the pumping diaphragm and thus the largest volume displacement takes place.
- this is the center of a circular pumping membrane, which may also be referred to as an actuator membrane. It can thereby be achieved that the volume of fluid flowing through the pump has the shortest path from the inlet to the outlet of the pump.
- a spacer arranged between two pump diaphragms for realizing a compression ratio which is as large as possible is designed such that the pumping chamber volume is as large as possible as large as the displacement volume of the pump diaphragms.
- the two pump diaphragms can be supplied with the same electrical periodic control signal, whereby both pump diaphragms oscillate in phase and simultaneously reduce and enlarge the pump chamber volume at the same time.
- a medium to be pumped for example, a liquid or a gas
- the pumping direction is given by the directions in which allow the check valves in the membranes flow.
- Fig. 6 shows an embodiment of a pump arrangement according to the invention, in which three pumps, as shown in Fig. 6, are stacked to be fluidly connected in series.
- FIG. 6 there are three pumps, each of which may correspond to the pumps described above with reference to FIG. 5, fluidly connected in series by housing parts 110a, 110b, 110c, 11Od and 11Oe, so that a pumping path between a pump assembly inlet 112 and a pump assembly outlet 114, as indicated by arrows 120 in FIG.
- the micropump assembly shown in Fig. 6 may be considered as a compressor in which a plurality of pumps are stacked one above the other.
- the pumps can be connected to each other via any type, for example by clamping technology, adhesive technology or other suitable connection techniques. Such an arrangement automatically ensures pressure equalization of the pumping membranes.
- An electrical contact of the piezoelectric ceramics can also be effected via the connection points, or via corresponding housing parts, as indicated schematically for the uppermost pump module in Fig. 6 by reference numeral 110.
- a suitable termination is mounted on the top and bottom of the resulting pump stack by housing parts 110a and 11Oe. This can be provided with appropriate connections for the medium to be pumped, such as Luer connections or the like.
- the opening direction of all check valves in the example shown in Fig. 6 is from bottom to top, so that in a simultaneous operation of the membranes, such as With reference to FIG. 5, pump action has been achieved from the pump assembly inlet 112 to the pump tunneling outlet 114.
- pump action has been achieved from the pump assembly inlet 112 to the pump tunneling outlet 114.
- Embodiments of the present invention are based on a drive by a piezoelectric ceramic.
- alternative drives such as electrostatic drives, may be used.
- electrostatic drives areas of the pumping membrane can serve as electrodes, while counter-electrodes are provided to attract these membrane areas in order to effect a corresponding deflection of the membrane can.
- Embodiments of the present invention make it possible, by the type of fluid guidance through the pumping membrane or the pumping diaphragms, that the fluid flow experiences the least possible losses due to deflections and that the actuator diaphragms are automatically in a pressure-balanced state.
- a control device may be provided to operate the pumping membrane or the pumping membranes (for example, a piezo-steel ring actuator) at its resonant frequency, whereby the amplitude of vibration of the same can be maximized with only low operating voltage, which in turn allow very large flow rates can.
- the moving parts ie the one or more pumping diaphragms
- the moving parts may be designed so that the first mechanical resonance is above the audible.
- an audible threshold can be considered a frequency of 20 kHz, from which a normal adult human sounds can no longer perceive.
- the pumping membrane can be designed such that the first mechanical resonance thereof is between 20 and 40 kHz.
- the control device can be provided in order to operate the pump membrane or the pump diaphragms at the first mechanical resonance of the same, so that noise disturbances can be avoided on account of the low noise emission.
- Micropumps or microcompressors according to the invention can achieve delivery rates which are hitherto unknown for piezo-actuated actuators.
- delivery rates in resonant mode between 1.6 and over 2 liters per minute can be achieved with pumps according to the invention, for example at a drive voltage (peak to peak) of 100 volts or less, a diameter of the microcompressor of about 50 mm or below and a thickness of the actuator membrane of 300 microns and the piezo membrane of 500 microns, and a thickness of the entire pumping module of FIG. 5 (without housing) of 1.8 mm or less.
- Such delivery rates are a factor of 50 above the delivery rates (conveying medium air) of known piezo-driven micropumps.
- Embodiments of pumps according to the invention can be used for any technical fields of application, for example microcooling systems, fuel cells or portable devices which require an air or gas flow in the range of one liter / minute and more.
- Embodiments of the present invention enable high delivery rates at desired pressures using a piezo membrane annular actuator having an inlet and an outlet, the piezo membrane annular actuator having a recess in which a microvalve is mounted.
- a check valve is provided in the membrane.
- a plurality of equally-acting check valves may be arranged side by side in the pumping membrane in parallel.
- the housing parts described above with reference to embodiments of the invention may be made of any suitable materials, such as plastic, glass, silicon, metal or the like.
- the pumping membrane and / or the piezoceramic disposed thereon may be provided with an insulating layer, in order to enable the pumping of liquid media without the risk of a short circuit.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007050407A DE102007050407A1 (de) | 2007-10-22 | 2007-10-22 | Pumpe, Pumpenanordnung und Pumpenmodul |
| PCT/EP2008/008895 WO2009053027A2 (de) | 2007-10-22 | 2008-10-21 | Pumpe, pumpenanordnung und pumpenmodul |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2207963A2 true EP2207963A2 (de) | 2010-07-21 |
| EP2207963B1 EP2207963B1 (de) | 2015-07-29 |
Family
ID=40458948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08842526.9A Not-in-force EP2207963B1 (de) | 2007-10-22 | 2008-10-21 | Pumpe und pumpenanordnung pumpenmodul |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9217426B2 (de) |
| EP (1) | EP2207963B1 (de) |
| DE (1) | DE102007050407A1 (de) |
| WO (1) | WO2009053027A2 (de) |
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| US9506463B2 (en) * | 2011-09-21 | 2016-11-29 | Kci Licensing, Inc. | Disc pump and valve structure |
| DE102012013681A1 (de) * | 2012-07-11 | 2014-01-16 | Pfeiffer Vacuum Gmbh | Pumpenmodul, sowie Verdrängerpumpe |
| CN106062364B (zh) | 2014-02-21 | 2018-03-13 | 株式会社村田制作所 | 鼓风机 |
| US10030641B2 (en) | 2015-03-16 | 2018-07-24 | Cummins Emission Solutions, Inc. | Valve system |
| JP6319517B2 (ja) * | 2015-06-11 | 2018-05-09 | 株式会社村田製作所 | ポンプ |
| CN108496004B (zh) | 2016-02-01 | 2020-03-31 | 株式会社村田制作所 | 气体控制装置 |
| US10563642B2 (en) * | 2016-06-20 | 2020-02-18 | The Regents Of The University Of Michigan | Modular stacked variable-compression micropump and method of making same |
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| WO2018027108A1 (en) * | 2016-08-05 | 2018-02-08 | Marsh Stephen Alan | Micro pressure sensor |
| TWI613367B (zh) | 2016-09-05 | 2018-02-01 | 研能科技股份有限公司 | 流體控制裝置 |
| TWI625468B (zh) | 2016-09-05 | 2018-06-01 | 研能科技股份有限公司 | 流體控制裝置 |
| TWI602995B (zh) * | 2016-09-05 | 2017-10-21 | 研能科技股份有限公司 | 流體控制裝置 |
| WO2018098505A1 (en) * | 2016-11-28 | 2018-05-31 | Massachusetts Institute Of Technology | Vacuum pumps and methods of manufacturing the same |
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| DE19719862A1 (de) | 1997-05-12 | 1998-11-19 | Fraunhofer Ges Forschung | Mikromembranpumpe |
| US6179586B1 (en) * | 1999-09-15 | 2001-01-30 | Honeywell International Inc. | Dual diaphragm, single chamber mesopump |
| EP1403519A1 (de) * | 2002-09-27 | 2004-03-31 | Novo Nordisk A/S | Membranpumpe mit dehnbarer Pumpenmembran |
| KR100483079B1 (ko) * | 2002-10-23 | 2005-04-14 | 재단법인서울대학교산학협력재단 | 능동형 마이크로 냉각기 |
| US7322803B2 (en) * | 2004-12-30 | 2008-01-29 | Adaptivenergy, Llc. | Pumps with diaphragms bonded as bellows |
| US20060232167A1 (en) * | 2005-04-13 | 2006-10-19 | Par Technologies Llc | Piezoelectric diaphragm with aperture(s) |
| GB0508194D0 (en) * | 2005-04-22 | 2005-06-01 | The Technology Partnership Plc | Pump |
-
2007
- 2007-10-22 DE DE102007050407A patent/DE102007050407A1/de not_active Withdrawn
-
2008
- 2008-10-21 WO PCT/EP2008/008895 patent/WO2009053027A2/de not_active Ceased
- 2008-10-21 EP EP08842526.9A patent/EP2207963B1/de not_active Not-in-force
- 2008-10-21 US US12/739,031 patent/US9217426B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009053027A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20110280755A1 (en) | 2011-11-17 |
| EP2207963B1 (de) | 2015-07-29 |
| US9217426B2 (en) | 2015-12-22 |
| DE102007050407A1 (de) | 2009-04-23 |
| WO2009053027A3 (de) | 2009-11-05 |
| WO2009053027A2 (de) | 2009-04-30 |
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