WO2002064254A2 - Digitalbürette und verfahren zum anzeigen des dosiervolumens einer solchen digitalbürette - Google Patents
Digitalbürette und verfahren zum anzeigen des dosiervolumens einer solchen digitalbürette Download PDFInfo
- Publication number
- WO2002064254A2 WO2002064254A2 PCT/DE2002/000064 DE0200064W WO02064254A2 WO 2002064254 A2 WO2002064254 A2 WO 2002064254A2 DE 0200064 W DE0200064 W DE 0200064W WO 02064254 A2 WO02064254 A2 WO 02064254A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sector disk
- digital
- processor
- sensors
- display device
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/0203—Burettes, i.e. for withdrawing and redistributing liquids through different conduits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
- B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
- B01L3/0227—Details of motor drive means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T436/00—Chemistry: analytical and immunological testing
- Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
- Y10T436/2575—Volumetric liquid transfer
Definitions
- the invention relates to a digital burette with the features of the preamble of claims 1 or 4 and to a method for displaying the metering volume of such a digital burette.
- Digital burettes are used in a large number of measurement analysis determinations, such as titrations, for the exact dosing of defined liquid volumes.
- measurement analysis determinations such as titrations
- the presetting and the reproducibility of the metering volume to be dispensed which is displayed by a digital display device, such as a display.
- the operation of such digital burettes is based on a reciprocating piston guided in a pipetting channel for drawing in the liquid to be dosed, the reciprocating piston usually being connected to the liquid via an air cushion.
- the reciprocating piston is manually driven, e.g. B. means of a rotary handle can be actuated, the rotary movement being transmitted to the reciprocating piston via a mechanical gear in order to draw in or deliver the desired volume of liquid.
- an increment encoder that is operatively connected to the gearbox and a sensor for detecting the signals generated by the increment encoder are provided.
- the sensor is connected to a processor, which uses the signals to calculate the dosing volume, which is determined by means of a digital display device, e.g. B. is displayed with a liquid crystal display, LEDs or the like.
- a slotted disk with slots arranged one behind the other in the circumferential direction can be provided as the increment encoder.
- an optical sensor e.g. B. a light barrier that detects the number of slots passing through the sensor.
- a second optical sensor e.g. B. a second light barrier, or a fork light barrier can be provided so that the direction of rotation of the slotted disc results from the order of the signals generated by the two sensors.
- Sector disks with two groups of sectors of different magnetic field strengths are also known as increment encoders, the sectors of the two groups being arranged alternately in the direction of rotation of the sector disk.
- the sectors can be formed, for example, by permanent magnets which alternately induce different and / or oppositely directed magnetic fields.
- only every second sector of the sector disk can be formed by a magnet, while the sectors arranged between the magnets do not are table.
- a magnetic field-dependent sensor is provided, which operates in the manner of a magnetic switch and opens or closes exclusively on the basis of the magnetic field induced by the respective magnet.
- These sensors have the advantage of low power consumption, since they only require the voltage supply required to detect the opening or closing position, while the opening and closing process is per se purely mechanical due to the field force induced by the magnets of the sector disk.
- the sensor thus generates an essentially rectangular voltage or current signal when the sector disk is rotated.
- Replacing the cells means removing or replacing the entire board and is therefore complex and expensive. Loss of use also occurs because the circuit boards cannot be kept in stock for a long time without affecting the lithium cells.
- the object of the invention is to remedy this.
- the invention is based on a digital burette with a manual drive for aspirating and dispensing an adjustable dosing volume, a downstream transmission and a digital display device controlled by the latter for setting the desired dosing volume, the control unit comprising an increment encoder, which is operatively connected to the transmission, and at least one sensor for detecting the signals generated by the increment encoder and a processor connected to the sensor for calculating the metering volume corresponding to the number of signals, and the processor is connected to the digital display device.
- the object of the invention is achieved in that at least one solar cell is provided for the power supply of the control.
- the solar cell expediently also serves to supply power to the digital display device.
- the configuration according to the invention makes any exchange of batteries, accumulators or the like unnecessary.
- the solar cells always ensure safe and reliable operation of the digital burette. You are advantageous on a side facing away from the discharge organ of the digital burette, z. B. arranged on the back or top.
- Increment encoder a sector disk with two groups of sectors of different magnetic field strength, which are arranged alternately in the direction of rotation of the sector disk, and at least one magnetic field-dependent sensor, preferably a reed sensor, is provided for detecting the number of revolutions of the sector wheel.
- the invention further relates to a digital burette with a manual drive for sucking in and dispensing an adjustable metering volume, a downstream transmission and a digital display device controlled by the latter for setting the metering volume, the control unit having an incremental encoder in the form of a sector disk that is operatively connected to the transmission with two groups of sectors of different magnetic field strength, which are arranged alternately in the direction of rotation of the sector disk, comprises at least one magnetic field-dependent sensor for detecting the number of revolutions of the sector disk and a processor connected to the sensor for calculating the metering volume corresponding to the number of revolutions of the sector disk and the processor on the digital display device is connected.
- the object of the invention is achieved in that two magnetic field-dependent sensors, preferably reed sensors, arranged at a distance in the direction of rotation of the sector disk are provided for calculating the metering volume as a function of the number of revolutions of the sector disk, the angular spacing of the sensors being different from an integer Is a multiple of the angle between the sectors of the sector disk.
- This configuration makes it possible to considerably reduce the clock frequency of the processor with the same measuring accuracy, e.g. B. to reduce by about half, which is accompanied by a significant power saving, so that in the case of a supply from batteries or accumulators, the replacement intervals are considerably increased or - in the preferred case of using solar cells - the surface area of the solar cells required for the necessary current is considerably reduced, so that the solar cells can be arranged directly on a surface section of the housing of the digital burette ,
- Digital burettes with a different sensor system namely a slotted disc and two light barriers, are known, but the second light barrier is used exclusively to detect the direction of rotation of the slotted disc or the stroke direction of the reciprocating piston and thus a reduction in the clock frequency of the processor inevitably leads to an intolerable reduction the measuring accuracy.
- both sensors are used to calculate the metering volume as a function of the number of revolutions of the sector disk, in that the signals of the switching on and off processes of both sensors are sent to the processor to calculate the metering volume.
- the processor to calculate the metering volume.
- the exact position of the sector disk corresponding to the metering volume can then be determined on the basis of the relative position of the sector disk with respect to the two sensors or on the basis of both signals generated by the sensors, eg. B. the switching on and off of both sensors can be determined.
- the clock frequency of the processor and thus the current required for operation can be correspondingly reduced even with a rapid action of the reciprocating piston with the same measuring accuracy.
- any sensors come into question as sensors, due to the low power consumption, however, reed sensors in particular are of primary interest, which do not require any current for the switching process themselves and only require a low voltage to detect the opening and closing position.
- the power supply of at least some electrical and / or electronic components of the control is controlled as a function of the action of the transmission.
- the power supply of the sensors can be switched off when the transmission is at a standstill or when the transmission is operating, for. B. can be switched on again by means of a mechanical pulse.
- the power supply of the digital display device can be switched off with a preset delay when the transmission is at a standstill. B. goes out after a certain time.
- the processor preferably has a minimum operating voltage of at most 2 V.
- These known processors operate reliably up to a minimum operating voltage of 2 V and currently have the lowest power consumption, with efforts being made in the electronics industry to further miniaturize the processors and to further reduce the minimum operating voltage. It goes without saying that it is expedient to equip the digital burette according to the invention with such commercially available processors which require the lowest possible minimum operating voltage in order to keep the power consumption as low as possible. In the case of further developments, the processors currently envisaged are to be replaced by new, even more energy-efficient processors.
- the display device is assigned an electroless memory for storing at least the last selected metering volume.
- the last selected dosing volume can be recognized even after the digital burette has been standing for a long time, which is particularly desirable when using the digital burette for test series.
- the invention also relates to a method for displaying the metering volume of a digital burette with a manual drive for sucking in and discharging an adjustable metering volume, a downstream transmission and a digital display device controlled by the latter for adjusting the metering volume, the control in the form of an increment encoder which is operatively connected to the transmission a sector disk with two groups of sectors of different magnetic field strength, which are arranged alternately in the direction of rotation of the sector disk, at least one sensor, preferably a reed sensor, for detecting the number of revolutions of the sector disk and a processor connected to the sensor for calculating the number of revolutions of the Sector disk corresponding dosing Olumens includes and the processor is connected to the digital display device.
- the method according to the invention is characterized in that the signals from two sensors arranged in the direction of rotation of the sector disk with a spacing not equal to an integer multiple of the angle of the sectors of the sector disk are output to the processor and the metering volume is calculated on the basis of both signals, at least when the transmission is acting more slowly becomes.
- the direction of rotation of the sector wheel is also expediently recognized on the basis of the two signals.
- the metering volume is advantageously determined, at least in the case of slow action of the transmission, on the basis of the number of times the two sensors are switched on and off, that is to say, for example, from the sum of the number of times the sensors switch on and off Current or voltage pulses emitted by the processor, calculated.
- the processor is programmed with a presettable value of the number of revolutions of the sector disk, so that if the number of revolutions of the sector disk is less than the predetermined value, the metering volume is calculated on the basis of the number of times the sensors are switched on and off, while If the number of revolutions of the sector disk is greater than the predetermined value, the metering volume is calculated exclusively on the basis of the switching on and / or switching off processes of one of the two sensors.
- the metering volume is expediently calculated exclusively on the basis of the switch-on processes or also exclusively on the basis of the switch-off processes of one of the two sensors.
- a small metering volume can also be determined very precisely on the basis of the number of times the two sensors are switched on and off or from the sum of the current or voltage pulses emitted by the two sensors when the processor is switched on and off, the maximum error being less than the stroke of the reciprocating piston of the digital burette corresponding to one revolution of the sector disk by half a sector.
- the processor can be programmed with two different presettable values for the number of revolutions of the sector disk.
- the dosing volume is calculated based on the number of times the sensors are switched on and off. If the number of revolutions of the sector disk between the two specified values is determined, the dosing volume is then determined on the basis of the number of switch-on and switch-off processes of one of the two sensors, whereas if the number of revolutions of the sector disk is greater than the predetermined higher value, it is determined exclusively on the basis of the switch-on or switch-off processes of one of the two Sensors is determined. In this way, an even finer gradation of the operating states or the clocking of the processor is possible.
- the power supply of at least some electrical and / or electronic components of the control is preferably controlled as a function of the action of the transmission, it being possible in particular to switch off the power supply to the sensors when the transmission is at a standstill.
- the clock frequency of the processor is preferably reduced when the transmission is at a standstill.
- Another preferred energy-saving measure is that the power supply to the digital display device is switched off with a preset delay when the transmission is at a standstill.
- a minimum operating voltage of at most 2 V is advantageously applied to the processor, the voltage applied to the processor during operation being able to be selected, for example, between approximately 2 and 3.5 V.
- At least the metering volume last displayed by the display device is stored without current, so that even after the digital library has been idle for a long time, save the last selected dosing volume.
- control and the digital display device are advantageously supplied with current by at least one solar cell ,
- FIG. 1 shows a perspective of an embodiment of the drive block of a digital burette
- FIG. 2 shows a schematic view of the incremental encoder of the digital burette according to FIG. 1 with two sensors
- Fig. 3 shows the waveform on the one sensor
- FIG. 4 shows the signal curve on the other sensor according to FIG. 2;
- 6 shows the processor's slow action to calculate small do- signals from the sensors.
- the drive block 10 which is arranged in the head of a digital burette.
- the drive block 10 has a manual drive 11 in the form of a rotary handle 12. If necessary, an identical twist grip is arranged on the opposite side, which sits on a common axis.
- the axis is connected to a piston rod 16 of a reciprocating piston 17 via a mechanical gear 15 formed from gear wheels 13 and pinions 14.
- the piston rod 16 is designed as a toothed rack 18 on its upper section facing the driven side of the transmission 15.
- the reciprocating piston 17 is guided in a pipetting channel 19 and sealed against it by means of a sealing lip 20 in order to draw in or dispense the desired volume of liquid.
- a control with an incremental encoder 21 in the form of a sector disk 1 (FIG. 2) with two groups, which is operatively connected to the gear 15, is provided
- sectors 2, 3 of different magnetic field strength are provided, which are arranged alternately in the direction of rotation u of the sector disk 1.
- Sectors 2, 3 are equipped, for example, with permanent magnets of different polarities (north pole / south pole), so that the magnets of two adjacent sectors 2, 3 of sector disk 1 each induce a magnetic field with oppositely directed field lines.
- Sector disk 1 can also be provided with unipolar magnets, while the sectors 3 are not magnetic.
- the sector disk 1 has a total of eight sectors 2, 3.
- the angular spacing ⁇ z. B. is about 2/3 of the angle ⁇ between the sectors 2, 3 of the sector disk 1.
- the sensors S1, S2 are connected to a processor (not shown), which calculates the corresponding metering volume from the signals generated by the sensors S1, S2 when the sensor disk 1 acts, which can be determined by means of a digital display device 23 (FIG. 1), e.g. B. a liquid crystal display is displayed.
- the processor and the display device 23 are supplied with current by a solar cell 22 (FIG. 1).
- the sensors S1, S2 are also subjected to a low operating voltage from the solar cell 22, so that each sensor S1, S2 generates an essentially rectangular signal when the sector disk 1 rotates (FIGS. 3, 4).
- the rectangular signal comes about by opening and closing the reed sensors S1, S2 acting in the manner of a magnetic switch, with the opening of the sectors S1, S2 z. B. caused by the magnetic field of the sectors 2 and the closing by the magnetic field of the sectors 3 different therefrom.
- the angle ⁇ of the sectors 2, 3 is represented by the width of a signal and the angular distance ⁇ of the two sensors S1, S2 by the phase shift of the two signals II, 12 from which the direction of rotation of the sector disk 1 can be determined.
- control in the present exemplary embodiment differentiates between large and small metering volumes or between fast and slow action of the rotary handle, in that the processor is programmable with a preset value for the number of revolutions of the sector disk 1 and an input of the Processor the actual rotational speed of the sector Disc 1 is monitored and compared with the specified value.
- FIG. 5 shows the signals I s of the sensors S1, S2 used by the processor when the rotary handle 12 acts quickly to calculate the metering volume displayed by the display device 23.
- the switch-on processes that is to say only the rising edge of the signal from the sensor S1 (FIG. 3) are registered in the present exemplary embodiment when the action is rapid.
- Such a switching operation occurs once after the sector disk 1 has been rotated by two sectors 2, 3. Consequently, when the number of revolutions of the sector disk 1 is greater than the predetermined value, only every fourth switching operation of both sensors S1, S2 is used to calculate the metering volume. So corresponds to an increment z. B. 1 ⁇ l, each of the signals I s shown in FIG. 5 corresponds to 4 ⁇ l.
- the clock frequency and thus the power consumption of the processor can be reduced in this way if the gearbox acts quickly.
- the two sensors S1, S2 thus ensure increased measurement accuracy when the transmission 15 is slow, by generating four signals I s per revolution of the sector disk 1 by the angle ⁇ of a sector 2, 3. In this way, for example, even after an abruptly ended rapid rotation of the sector disk 1, an exact determination of the metering volume is ensured on the basis of the total signal I L.
- the current saving resulting from the lower power consumption of the processor as a result of the reduction of its clock frequency as a function of the action of the transmission 15 amounts to approximately 30% compared to the demand for a digital burette equipped with only one sensor.
Landscapes
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Automatic Analysis And Handling Materials Therefor (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0318657A GB2388330B (en) | 2001-02-13 | 2002-01-10 | Digital burette and method for displaying the dose volume in said digital burette |
US10/470,943 US7244397B2 (en) | 2001-02-13 | 2002-01-10 | Digital burette and method for displaying the dose volume in said digital burette |
DE10290448.0T DE10290448B4 (de) | 2001-02-13 | 2002-01-10 | Digitalbürette und Verfahren zum Anzeigen des Dosiervolumens einer solchen Digitalbürette |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10106463A DE10106463A1 (de) | 2001-02-13 | 2001-02-13 | Digitalbürette und Verfahren zum Anzeigen des Dosiervolumens einer solchen Digitalbürette |
DE10106463.2 | 2001-02-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002064254A2 true WO2002064254A2 (de) | 2002-08-22 |
WO2002064254A3 WO2002064254A3 (de) | 2003-01-03 |
Family
ID=7673759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/000064 WO2002064254A2 (de) | 2001-02-13 | 2002-01-10 | Digitalbürette und verfahren zum anzeigen des dosiervolumens einer solchen digitalbürette |
Country Status (4)
Country | Link |
---|---|
US (1) | US7244397B2 (de) |
DE (2) | DE10106463A1 (de) |
GB (1) | GB2388330B (de) |
WO (1) | WO2002064254A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005004956A1 (de) * | 2003-07-09 | 2005-01-20 | Tecpharma Licensing Ag | Injektionsgerät mit positionssensor |
EP1582259A1 (de) * | 2004-04-01 | 2005-10-05 | Eppendorf Ag | Elektronische Pipette |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8142738B2 (en) * | 2006-12-07 | 2012-03-27 | Brand Gmbh + Co Kg | Bottle top dispenser for handling liquids |
US8597593B2 (en) | 2006-12-07 | 2013-12-03 | Brand Gmbh + Co Kg | Bottle top dispenser for handling liquids |
EP3335795B1 (de) * | 2016-12-16 | 2019-03-27 | Eppendorf AG | Verfahren zum dosieren von flüssigkeit mittels einer pipette und einer spritze und pipette zum betätigen einer spritze zum dosieren von flüssigkeit |
EP3581274B1 (de) * | 2018-06-15 | 2021-09-08 | Sartorius Biohit Liquid Handling Oy | Flüssige handhabungsvorrichtung und verfahren zum energieren einer flüssigen handhabungsvorrichtung |
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EP0096088A2 (de) * | 1982-06-04 | 1983-12-21 | Rudolf Brand GmbH & Co. | Flaschenaufsatzkolbenbürette |
GB2138609A (en) * | 1983-04-19 | 1984-10-24 | Emi Ltd | Electronic counter for mechanical drive |
DE3516596A1 (de) * | 1985-04-02 | 1986-10-02 | Walter Graf U. Co Gmbh & Co, 6980 Wertheim | Praezisionsdosiergeraet mit digitaler anzeigevorrichtung |
US4760939A (en) * | 1985-05-04 | 1988-08-02 | Jencons (Scientific) Limited | Liquid dosing device with digital display |
DE3818531A1 (de) * | 1988-05-31 | 1989-12-07 | Walu Apparatetechnik Gmbh | Kolbenbuerette |
EP0559223A1 (de) * | 1992-03-06 | 1993-09-08 | Walu-Apparatetechnik Gmbh | Aufsteckmodul für ein Flaschendosiergerät |
WO1998010265A1 (en) * | 1996-09-09 | 1998-03-12 | Tyco Group S.A.R.L. | Electronically monitored mechanical pipette |
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US4267575A (en) * | 1979-07-09 | 1981-05-12 | The Bendix Corporation | Wheel speed signal-producing system for skid control |
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DE3834454C2 (de) * | 1987-07-28 | 2001-03-15 | Graco Inc | Fluidausgabevorrichtung |
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DE9406304U1 (de) * | 1994-04-18 | 1994-06-09 | Ingenieurbüro CAT M. Zipperer GmbH, 79219 Staufen | Vorrichtung zum programmierbaren Dosieren von Flüssigkeiten aller Art |
NL9400660A (nl) * | 1994-04-25 | 1995-12-01 | Averyck Eng Consultants Bv | Afgeefinrichting voor een spuitbus. |
WO1996022013A1 (de) * | 1995-01-18 | 1996-07-25 | Herbert Prieschl | Behältnis zum speichern, transportieren und ausbringen von flüssigkeit, insbesondere giesswasser oder trinkwasser |
DE19513023C2 (de) * | 1995-04-06 | 1997-06-12 | Hirschmann Glasgeraete | Dosiergerät |
DE19533120A1 (de) * | 1995-09-07 | 1997-03-13 | Interelectric Ag | Magnetischer Positionsgeber |
US6019004A (en) * | 1996-09-10 | 2000-02-01 | Sherwood Services, Ag | Detachable pipette barrel |
US6055509A (en) * | 1997-02-11 | 2000-04-25 | Ken R. Powell | System and method for transferring identification information between portable cards in a computerized retail store having communication among a plurality of computers |
US6339897B1 (en) * | 1997-07-08 | 2002-01-22 | Microfab Technologies, Inc. | Method and apparatus for dispensing airborne materials for controlling pests |
US6209752B1 (en) * | 1999-03-10 | 2001-04-03 | Kimberly-Clark Worldwide, Inc. | Automatic soap dispenser |
US7521020B2 (en) * | 1999-05-28 | 2009-04-21 | Case Western Reserve University | Device for precise chemical delivery and solution preparation |
US6824738B1 (en) * | 2000-04-14 | 2004-11-30 | Discovery Partners International, Inc. | System and method for treatment of samples on solid supports |
US6474180B2 (en) * | 2001-03-20 | 2002-11-05 | Hirschmann Laborgeräte | Pipette device |
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2001
- 2001-02-13 DE DE10106463A patent/DE10106463A1/de not_active Withdrawn
-
2002
- 2002-01-10 DE DE10290448.0T patent/DE10290448B4/de not_active Expired - Lifetime
- 2002-01-10 US US10/470,943 patent/US7244397B2/en not_active Expired - Lifetime
- 2002-01-10 GB GB0318657A patent/GB2388330B/en not_active Expired - Lifetime
- 2002-01-10 WO PCT/DE2002/000064 patent/WO2002064254A2/de active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
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EP0096088A2 (de) * | 1982-06-04 | 1983-12-21 | Rudolf Brand GmbH & Co. | Flaschenaufsatzkolbenbürette |
GB2138609A (en) * | 1983-04-19 | 1984-10-24 | Emi Ltd | Electronic counter for mechanical drive |
DE3516596A1 (de) * | 1985-04-02 | 1986-10-02 | Walter Graf U. Co Gmbh & Co, 6980 Wertheim | Praezisionsdosiergeraet mit digitaler anzeigevorrichtung |
US4760939A (en) * | 1985-05-04 | 1988-08-02 | Jencons (Scientific) Limited | Liquid dosing device with digital display |
DE3818531A1 (de) * | 1988-05-31 | 1989-12-07 | Walu Apparatetechnik Gmbh | Kolbenbuerette |
EP0559223A1 (de) * | 1992-03-06 | 1993-09-08 | Walu-Apparatetechnik Gmbh | Aufsteckmodul für ein Flaschendosiergerät |
WO1998010265A1 (en) * | 1996-09-09 | 1998-03-12 | Tyco Group S.A.R.L. | Electronically monitored mechanical pipette |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005004956A1 (de) * | 2003-07-09 | 2005-01-20 | Tecpharma Licensing Ag | Injektionsgerät mit positionssensor |
DE10330984B4 (de) * | 2003-07-09 | 2009-12-10 | Tecpharma Licensing Ag | Injektionsgerät mit Positionssensor |
EP1582259A1 (de) * | 2004-04-01 | 2005-10-05 | Eppendorf Ag | Elektronische Pipette |
Also Published As
Publication number | Publication date |
---|---|
DE10106463A1 (de) | 2002-08-14 |
GB2388330B (en) | 2004-09-29 |
GB2388330A (en) | 2003-11-12 |
DE10290448B4 (de) | 2015-08-06 |
GB0318657D0 (en) | 2003-09-10 |
US20040057875A1 (en) | 2004-03-25 |
WO2002064254A3 (de) | 2003-01-03 |
DE10290448D2 (de) | 2004-01-15 |
US7244397B2 (en) | 2007-07-17 |
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