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Publication numberUS3620676 A
Publication typeGrant
Publication dateNov 16, 1971
Filing dateFeb 20, 1969
Priority dateFeb 20, 1969
Publication numberUS 3620676 A, US 3620676A, US-A-3620676, US3620676 A, US3620676A
InventorsWard Benjamin Davis
Original AssigneeSterilizer Control Royalties A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Disposable colorimetric indicator and sampling device for liquids
US 3620676 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

United States Patent Inventor Ward Benjamin Davis Glendale, Calif.

Appl. No. 800,887

Filed Feb. 20, 1969 Patented Nov. 16, 1971 Assignee Sterilizer Control Royaltla (a Trust) Los Angeles, Calif.

DISPOSABLE COLORIMETRIC INDICATOR AND SAMPLING DEVICE FOR LIQUIDS 253,259; 206/43,56 A, 17.5; 128/2 R, 231, 132; 116/l14.l9, 114.20

[56] References Cited UNITED STATES PATENTS 2,940,448 6/1960 Furlong, J1. 23/259 UX 3,476,515 11/1969 Johnson et a]. 23/253 X Primary Examiner-Morris O. Wolk Assistant Examiner-R. M. Reese Attorney-Miner L. l-lartmann ABSTRACT: A disposable colorimetric indicator and sampling device for liquids is formed by embossing a synthetic plastic sheet with a syringelilte cavity and closing the cavity by adhering a plane synthetic plastic sheet over the cavity, the two sheets being either heat sealed or adhesively joined together on the margins around the cavity, the cavity having a tubular portion one end of which opens at the edge of the adhered sheets, and the other end of the cavity being enlarged to form a finger compressible enlargement. A coating of a colorimetric indicator composition, soluble in or reactive with the liquid to be tested, is provided, the liquid being drawn into the tubular cavity by first compressing the enlargement, and releasing the pressure to draw in a liquid sample to react with the colorimetric indicator coating.

PATENTEDMJv 15 197i N [/5 N 70 WARD BENJAMIN DA ws DISPOSABLE COLORIMETRIC INDICATOR AND SAMPLING DEVICE FOR LIQUIDS BACKGROUND OF THE INVENTION This invention relates to a simple portable disposable indicator and sampling device by which a sample of an aqueous liquid may be withdrawn from a larger quantity, and tested colorimetrically either qualitatively or semiquantitively for a selected constituent, for examples, for hydrogen ion concentration of a water solution, or for the presence of free chlorine in the water in a swimming pool, or for ascertaining the presence of other chemically detectable ingredients. The device includes not only chemical reagent for detection of the desired ingredient, but also the reaction vessel and the means for filling it with a liquid sample. At least one facet of the device adjacent the tubular cavity is transparent.

One object of the invention is to provide inexpensive formed plastic disposable indicators for making semiquantitive analyses of liquids. Another object is to provide means for withdrawing a sample of liquid in a formed syringelike device which also contains a colorimetric reagent. A further object is to provide a syringelike indicator device consisting of a plane plastic backing sheet adhered to an embossed plastic sheet, wherein the embossed figure is a tubular cavity with a closed compressible end portion and an opening at the edge of the device.

These and other objects are attained by my invention, which will be understood from the following description, reference being made to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged plan view of a preferred form of the indicator device;

FIG. 2 is a cross-sectional view taken on the line 2-2 of FIG. 1;

FIG. 3 is a cross-sectional view taken on the line 3-3 of FIG. 1;

FIG. 4 is a cross-sectional view taken on the line 4-4 of FIG. 1;

FIG. 5 is a cross-sectional view similar to FIG. 4 of an alternative form of my device;

FIG. 6 is a plan view of a second alternative form of my device; and

FIG. 7 is a cross-sectional view taken on the line 7-7 of FIG. 6.

DESCRIPTION OF PREFERRED EMBODIMENTS Referring to the drawings, particularly FIGS. 1 to 4, the indicator device 10 consists of a plane backing sheet 11 of elongated shape such as a trapezoid sr rectangle, and an embossed sheeted front member 12, both of synthetic plastic composition, for example, polyvinyl chloride. At least the from sheet is deformable. The front sheet is preformed in the center portion longitudinally with a half-tubular cavity 13 terminating at the lower edge and a half-bulb cavity 14 connected to said tubular part near the upper edge of the front sheet. The front sheet 12 and the back sheet 11 are heat sealed, or alternatively adhesively joined together in the margins around the cavities so that a tubular portion terminating in a halfor part-bulb are formed, the tubular portion opening in the lower edge of the device at 15. Prior to the assembly of the parts, a stripe 16 of a selector indicator composition is imprinted by flexographic printing, on the backing sheet 11 at a position coinciding with the subsequent position of the tube.

The indicator devices are manufactured in multiples from large sheets, and subsequently are die-cut into the final individual indicators. The back sheet is printed, flexographically, with properly spaced indicator stripes, and the front sheet is embossed or heat formed with a plurality of connected tube and bulb impressions, and the large sheets are surface joined in aligned superimposition.

As shown in FIG. 5, an opaque sheet 17 may be attached to the transparent backing sheet 11, or the backing sheet may be formed of a white plastic composition to provide a white comparison background for the indicator-produced color in the liquid within the tube.

In the alternative form shown in FIGS. 6 and 7, no enlargement or bulb is provided, and the upper portion of the tubular portion may be compressed and released in the same manner as in the preferred bulb type above described.

The preferred material for making the indicator device is sheeted polyvinyl chloride plastic, but other sheeted materials having similar properties may be used, for one example polystyrene. The sheet thickness may be varied, but in the range of 6 to 10 mils is satisfactory. The tube opening may be about one thirty-second to one-sixteenth inch by about onequarter inch wide. The dimensions given are illustrative and are not critical.

The indicator stripe or coating is preferably printed at the proper location on the backing sheet by flexographic printing using fiexographic-type ink. One such composition for use in detection of hydrogen ion concentration consisted of the following essential ingredients in the approximate proportions, which are not critical:

Methanol 8 parts by weight 2-ethoxyethanol 2 parts by weight Phenol red dye 0.1 to 0.5 parts by weight I claim:

1. A disposable colorimetric indicator and sampling device for liquids, comprising a syringelike body formed with sheets of synthetic plastic, and having a tubular cavity with one end open, at least one face of said tubular cavity being transparent and a colorimetric indicator reagent combined in said cavity.

2. The device defined in claim 1 in which said body comprises plane backing sheet of plastic adhered to the plane margins around a figure embossed in a sheet of plastic, said figure consisting of a tubular cavity having an enlargement closing one end thereof, the open end of said tubular cavity being at one edge of said embossed sheet.

3. The device defined in claim 1 in which the said tubular cavity has a coating over at least part of its inside wall, said coating comprising an indicator reagent soluble in the liquid to be tested.

4. The device defined in claim 2 in which the said tubular cavity has a coating over at least part of its inside wall, said coating comprising an indicator reagent soluble in the liquid to be tested.

5. The device defined in claim 4 in which said partial coating on said tubular cavity wall is a stripe of fiexographic ink comprising a colorimetric pI-I indicator.

6. The device claimed in claim 4 in which said partial coating on said tubular cavity wall is a stripe of flexographic ink comprising a free chlorine indicator.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2940448 *Apr 29, 1957Jun 14, 1960Jr Norman B FurlongDisposable blood-gas analyzer
US3476515 *Apr 26, 1966Nov 4, 1969Du PontAnalytical test pack and process for analysis
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3768974 *Mar 22, 1971Oct 30, 1973Sterilizer Control RoyaltiesDisposable colorimetric indicator device for measuring the concentration of chlorine in water
US3798004 *Apr 18, 1972Mar 19, 1974Ames Yissum LtdTest device
US3898982 *Sep 27, 1973Aug 12, 1975Jintan Terumo CoCapillary tube for blood examination
US4088448 *Sep 16, 1976May 9, 1978Lilja Jan EvertApparatus for sampling, mixing the sample with a reagent and making particularly optical analyses
US4357945 *Jun 1, 1981Nov 9, 1982Janko Albert BDevice for testing and rupturing amniotic membrane
US4384485 *Feb 11, 1980May 24, 1983The Kendall CompanyDevice for indicating liquid level
US4469110 *Jun 17, 1982Sep 4, 1984Slama Gerard JDevice for causing a pinprick to obtain and to test a drop of blood
US4753249 *Feb 17, 1987Jun 28, 1988Davstar Industries, Inc.Urinometer and patient record combination
US4910406 *Dec 29, 1988Mar 20, 1990E. I. Du Pont De Nemours And CompanyMethod for detecting the presence of contaminants in a reusable plastic food or beverage container
US6001307 *Apr 22, 1997Dec 14, 1999Kyoto Daiichi Kagaku Co., Ltd.Device for analyzing a sample
US6084660 *Jul 16, 1999Jul 4, 2000Lifescan, Inc.Initiation of an analytical measurement in blood
US6125292 *Dec 7, 1998Sep 26, 2000Kyoto Daiichi Kagaku Co., Ltd.Sensor and a set of sensors
US6180062Feb 22, 1999Jan 30, 2001Kyoto Daiichi Kagaku Co., Ltd.Device for analyzing a sample
US6261519Jul 16, 1999Jul 17, 2001Lifescan, Inc.Medical diagnostic device with enough-sample indicator
US6325975Aug 20, 1998Dec 4, 2001Arkray, Inc.Suction generating device and sample analysis apparatus using the same
US6521182Jun 15, 1999Feb 18, 2003Lifescan, Inc.Fluidic device for medical diagnostics
US6607701 *Apr 3, 2000Aug 19, 2003Hemocue AbProduction of microcuvettes
US6652814Aug 11, 2000Nov 25, 2003Lifescan, Inc.Strip holder for use in a test strip meter
US6777242 *Sep 8, 1999Aug 17, 2004AtofinaAqueous solution based on an azo dye, process for its manufacture and use thereof
US6830934Dec 3, 1999Dec 14, 2004Lifescan, Inc.Microdroplet dispensing for a medical diagnostic device
US6866822Aug 11, 2000Mar 15, 2005Lifescan, Inc.Gimbaled bladder actuator for use with test strips
US6991762Sep 5, 2000Jan 31, 2006Arkray, Inc.Device for analyzing a sample
US7005109Jan 14, 2002Feb 28, 2006Eppendorf AgSystem for handling liquid samples
US7022286Dec 26, 2002Apr 4, 2006Lifescan, Inc.Fluidic device for medical diagnostics
US7150995Jan 16, 2004Dec 19, 2006Metrika, Inc.Methods and systems for point of care bodily fluid analysis
US7255832 *Sep 17, 2004Aug 14, 2007Quidel CorporationIconic colorimetric test device with reduced susceptibility to false positive and false negative readings
US7635597Apr 19, 2004Dec 22, 2009Bayer Healthcare LlcDry reagent particle assay and device having multiple test zones and method therefor
US8343074Jun 30, 2004Jan 1, 2013Lifescan Scotland LimitedFluid handling devices
US8485360Mar 4, 2011Jul 16, 2013Sands Innovations Pty, Ltd.Fracturable container
US8511500Jun 7, 2010Aug 20, 2013Sands Innovations Pty. Ltd.Dispensing container
US8523016Dec 9, 2008Sep 3, 2013Sands Innovations Pty Ltd.Dispensing container
US8528736Oct 8, 2010Sep 10, 2013Sands Innovations Pty Ltd.Frangible container with hinge cover
US8919594 *Jan 31, 2008Dec 30, 2014Sands Innovations Pty LtdDispensing container
US9352316 *Apr 28, 2015May 31, 2016Carclo Technical Plastics LimitedCapillary fluid flow control
US20020061260 *Jan 14, 2002May 23, 2002Dieter HusarDevice for handling liquid samples and a process for the manufacture of the device, and a system for handling liquid samples
US20020064480 *Jan 17, 2002May 30, 2002Shartle Robert JusticeFluidic device for medical diagnostics
US20020098114 *Feb 1, 2002Jul 25, 2002Harding Ian A.Microdroplet dispensing for a medical diagnostic device
US20020110486 *Apr 11, 2002Aug 15, 2002Shartle Robert JusticeAnalyte test strip with two controls
US20020110922 *Apr 11, 2002Aug 15, 2002Shartle Robert JusticeVacuum loaded test strip and method of use
US20020192833 *Aug 26, 2002Dec 19, 2002Victor PanMethod and apparatus for detecting the presence of a fluid on a test strip
US20030156983 *Dec 26, 2002Aug 21, 2003Shartle Robert JusticeFluidic device for medical diagnostics
US20030156984 *Dec 26, 2002Aug 21, 2003John LemkeFluidic device for medical diagnostics
US20030210287 *Jun 13, 2003Nov 13, 2003Harding Ian A.Microdroplet dispensing methods for a medical diagnostic device
US20040057878 *Sep 24, 2003Mar 25, 2004Allen HouseStrip holder for use in a test strip meter
US20040109790 *Sep 18, 2003Jun 10, 2004Shartle Robert JusticeVacuum loaded test strip with stop junction and bypass channel
US20050070021 *Sep 17, 2004Mar 31, 2005Quidel Corporation, A Delaware CorporationIconic colorimetric test device with reduced susceptibility to false positive and false negative readings
US20050226767 *Sep 23, 2003Oct 13, 2005Hartmut KlockeDevice for determing and displaying at least one physical, chemical or biological property of a test liquid
US20060000709 *Jun 30, 2004Jan 5, 2006Sebastian BohmMethods for modulation of flow in a flow pathway
US20060000710 *Jun 30, 2004Jan 5, 2006Klaus Peter WeidenhauptFluid handling methods
US20060001551 *Jun 30, 2004Jan 5, 2006Ulrich KraftAnalyte monitoring system with wireless alarm
US20060002817 *Jun 30, 2004Jan 5, 2006Sebastian BohmFlow modulation devices
US20060018790 *Sep 23, 2005Jan 26, 2006Arkray, Inc.Device and method for analyizing a sample
US20080032411 *Jul 6, 2007Feb 7, 2008Quidel CorporationIconic Colorimetric Test Device with Reduced Susceptibility To False Positive and False Negative Readings
US20090137931 *Jan 26, 2009May 28, 2009Chan Frank ALancet integrated test element tape dispenser
US20100116772 *Jan 31, 2008May 13, 2010Sands Innovations Pty Ltd.dispensing utensil and manufacturing method therefor
US20150238957 *Apr 28, 2015Aug 27, 2015Carclo Technical Plastics LimitedCapillary fluid flow control
DE19933458A1 *Jul 15, 1999Feb 8, 2001Eppendorf Geraetebau NethelerEinrichtung zum Handhaben von Flüssigkeitsproben, System zum Handhaben von Flüssigkeitsproben und Verfahren zum Herstellen der Einrichtung
DE19933458B4 *Jul 15, 1999Aug 20, 2015Eppendorf AgEinrichtungen und Systeme zum Handhaben von Flüssigkeitsproben
EP0203930A1 *Aug 22, 1985Dec 10, 1986Cedars Sinai Medical CenterPortable blood typing apparatus and method.
EP0203930A4 *Aug 22, 1985Mar 26, 1987Cedars Sinai Medical CenterPortable blood typing apparatus and method.
EP0803288A2 *Apr 25, 1997Oct 29, 1997Kyoto Daiichi Kagaku Co., Ltd.Device and method for analyzing a sample
EP0903180A2 *Aug 27, 1998Mar 24, 1999Kyoto Daiichi Kagaku Co., Ltd.Suction generating device and sample analysis apparatus using the same
EP1019700A1 *Oct 2, 1998Jul 19, 2000Hemocue ABProduction of microcuvettes
EP1240945A2 *Apr 25, 1997Sep 18, 2002Kyoto Daiichi Kagaku Co., Ltd.Device and method for analyzing a sample
WO1979000122A1 *Aug 31, 1978Mar 22, 1979Fospur LtdIdentification of hazardous nature of unknown materials
WO2004030821A1 *Sep 23, 2003Apr 15, 2004Klocke Verpackungs-Service GmbhDevice for determining and displaying at least one physical, chemical or biological property of a test liquid
Classifications
U.S. Classification422/405, 600/584, 206/569, 206/305, 206/459.1, 422/944, 116/200, 422/425
International ClassificationB01L3/00
Cooperative ClassificationB01L3/505
European ClassificationB01L3/505
Legal Events
DateCodeEventDescription
Dec 19, 1988ASAssignment
Owner name: PYMAH CORPORATION
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DESERET MEDICAL, INC.,;REEL/FRAME:004989/0033
Effective date: 19880601