US3247866A - Pipette - Google Patents

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Publication number
US3247866A
US3247866A US32291663A US3247866A US 3247866 A US3247866 A US 3247866A US 32291663 A US32291663 A US 32291663A US 3247866 A US3247866 A US 3247866A
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US
United States
Prior art keywords
chamber
valve
opening
membrane
pressure
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.)
Expired - Lifetime
Application number
Inventor
Sanz Manuel Claude
Original Assignee
Sanz Manuel Claude
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
Priority to US8111661A priority Critical
Priority claimed from FR883913A external-priority patent/FR1309679A/en
Application filed by Sanz Manuel Claude filed Critical Sanz Manuel Claude
Priority to US32291663 priority patent/US3247866A/en
Application granted granted Critical
Publication of US3247866A publication Critical patent/US3247866A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01LCHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02Burettes; Pipettes
    • B01L3/0282Burettes; Pipettes mounted within a receptacle
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/02Devices for withdrawing samples
    • G01N1/10Devices for withdrawing samples in the liquid or fluent state
    • G01N1/14Suction devices, e.g. pumps; Ejector devices
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/2713Siphons
    • Y10T137/2842With flow starting, stopping or maintaining means
    • Y10T137/2863Pressure applied to liquid in supply chamber
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7847With leak passage
    • Y10T137/7848Permits flow at valve interface
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7879Resilient material valve
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7722Line condition change responsive valves
    • Y10T137/7837Direct response valves [i.e., check valve type]
    • Y10T137/7904Reciprocating valves
    • Y10T137/7908Weight biased
    • Y10T137/7909Valve body is the weight

Description

M. C. SANZ April 26, was

PIPETTE Original Filed Jan. 6, 1961 FIG.1

I NVENTOR. flmz/aaavos SA/vz.

United States Patent 3,247,866 PIPETTE Manuel Claude Sanz, 46 Avenue Tonrnay,

. Geneva, Switzerland Original application Jan. 6, 1961, Ser. No. 81,116, now Patent No. 3,118,306,'dated Jan. 21, 1964. Divided and this application Nov. 12, 1963, Ser. No. 322,916

. 1 Claim. (Cl. 137533) This invention relates to pipettes for transferring predetermined reproducible quantities of liquids.

This application is a division of US. application Serial No. 81,116 filed January 6, 1961, now Patent No. 3,118,- 306, which in turn is a continuation-impart of US. application Serial No. 652,265 filed April 11, 1957, now US. Patent No. 2,974,528. In that patent, there are disclosed pipettes which include the container or reservoir for the liquid to be transferred in reproducible quantities. Such pipettes comprise a measuring tube with one end extending into a chamber into which the liquid from the container or reservoir may be forced; the chamber has an outlet to the atmosphere which may be closed to force liquid from the chamber into the measuring tube and then opened to allow excess liquid to flow back into the reservoir when the outlet to the atmosphere is opened and pressure released. In order to deliver the liquid retained in the measuring tube, the outlet of the chamber is first closed and then pressure is applied to the reservoir which will force the liquid out of the measuring tube.

Among the objects of the present invention is to provide means for automatically closing the outlet of said chamber upon pressure applied to the reservoir and automatically opening said outlet upon release of said pressure.

The objects are attained by providing a very delicate valve means for the outlet of the chamber of said device,

In the drawings:

FIG. 1 is a side cross-sectional view of the chamber portion of a device showinga modified form of valve.

FIG. 2 is a cross-sectional view taken on line 66 of FIG. 1.

FIG. 3 is a cross-sectional view similar to FIG. 1, showing another form of valve.

FIG. 4 is a view taken on lines 88 of FIG. 3.

The chamber of FIGS. 1 and 3 corresponds to the chamber in the pipettes of said Patents 2,974,528 and 3,118,306 and has a tube 7 0 projecting therefrom. Chamber 20" also includes the pipette measuring tube 25, held by plug 24 in opening 23 of said chamber 20". The tube 70 is curved so that its outer end opens downwardly and is fitted with the valve casing 71. The front or lower end 72 of said valve contains the opening 73 and on the inside forms the valve seat for the movable valve membrane 74 which consists, for example, of a disk-shaped membrane cut from a film or thin sheet of impervious material such as polyethylene. The member 76 includes a central opening 77 continuous with the opening of tube 70. The central inner portion of member 76 extends fairly close to the valve membrane 74 to keep said membrane in position but said member 76 has slots 78, 79 extending from the opening 77 to the side of the member which slots prevent the movable membrane 74 from'shutting oif movement of air into the chamber 20". Since the movable valve membrane 74 is very light in weight and has a minimum of inertia, the membrane moves quickly to open the valve when pressure is released within the chamber 20" and does not permit any liquid to be aspirated from capillary 25.

' In the modification of FIGS. 3 and 4 the valve mechanism has a connecting tube 80 fitting in the opening 81 3,247,866 Patented Apr. 26, 1966 of chamber 20". The opening 86 of tube 80 extends through the backing plate 82 which forms a rest portion for the valve member 83. Plate 82 contains channels 84, 85 extending from the opening 86 to the sides thereof so that valve member 83 is not effective in shutting off the flow of air into the chamber 20". The upper end 87 of the valve has an internal flat surface and includes the opening 88. Valve member 83 is formed of two disk shaped membranes 89 and 90 of polyethylene or similar film which are held apart in the center portion by electrostatic repulsion or which are held apart by entrapped air between the completely sealed edges of the membranes. Upon application of pressure to the container and the transfer of such pressure to the chamber 20" the membranes 83 move against the inside surface of top 87 and close the opening 88. At the same time, the membrane valve 83 quickly opens orifice 88 when pressure is released from chamber 20".

The features and principles underlying the invention described above in connection with specific exemplifications will suggest to those skilled in the art many other modifications thereof. It is accordingly desired that the appended claim shall not be limited to any specific feature or details thereof.

I claim:

Valve means adapted to open and close in response to very slight changes in pressure comprising,

a casing including a valve seat on a first side thereof having a central opening and a relatively flat surface surrounding the opening,

said central opening of said first side being open to the atmosphere,

a light movable valve member comprising a membrane of at least one thin impervious plastic film and having area substantially greater than the area of said central opening,

said casing having a second side, which includes a fluid conduit, for limiting the movement of the valve member away from the first side,

said second side of said casing including grooves which connect the fluid conduit to a region beyond the area covered by said membrane whereby said membrane is not effective in stopping movement of fluid outward with respect to the second side, and in combination therewith a chamber to which pressure can be applied connected to said fluid conduit of said second side,

said light movable valve member comprising a pair of disks of plastic film sealed at the edges thereof with gas entrapped therebetween, said disk adjacent the opening of said first side being substantially flat.

References Cited by the Examiner UNITED STATES PATENTS FOREIGN PATENTS 8/ 1959 Great Britain.

ISADOR WEIL, Primary Examiner.

D. H. LAMBERT, Assistant Examiner.

US32291663 1961-01-06 1963-11-12 Pipette Expired - Lifetime US3247866A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US8111661A true 1961-01-06 1961-01-06
US32291663 US3247866A (en) 1961-01-06 1963-11-12 Pipette

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US3118306D US3118306A (en) 1961-01-06 Pipette
GB4651461A GB953937A (en) 1961-01-06 1961-12-28 Pipette
CH6362A CH392933A (en) 1961-01-06 1962-01-04 Fluid acquisition and dispensing device with pipette
FR883913A FR1309679A (en) 1961-01-06 1962-01-04 advanced pipette
DE19621498968 DE1498968B2 (en) 1961-01-06 1962-01-05
US32291663 US3247866A (en) 1961-01-06 1963-11-12 Pipette

Publications (1)

Publication Number Publication Date
US3247866A true US3247866A (en) 1966-04-26

Family

ID=26765214

Family Applications (2)

Application Number Title Priority Date Filing Date
US3118306D Expired - Lifetime US3118306A (en) 1961-01-06 Pipette
US32291663 Expired - Lifetime US3247866A (en) 1961-01-06 1963-11-12 Pipette

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US3118306D Expired - Lifetime US3118306A (en) 1961-01-06 Pipette

Country Status (4)

Country Link
US (2) US3247866A (en)
CH (1) CH392933A (en)
DE (1) DE1498968B2 (en)
GB (1) GB953937A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584639A (en) * 1965-06-08 1971-06-15 Gasudarstuenny Nii Orch Polvpr Discrete-operating pneumatic element for logical function
US3889710A (en) * 1972-11-07 1975-06-17 Julien H Brost Check valve with elastomeric valve element
US4718629A (en) * 1985-06-26 1988-01-12 Dr. Ing. Rudolf Hell Gmbh Vacuum holding device
US6371117B1 (en) * 1998-06-15 2002-04-16 Siemens Elema Ab Directional valve
US20090211656A1 (en) * 2008-02-21 2009-08-27 Kao Hsung Tsung Changeover unit for fuel gas pressure reducer

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203251A (en) * 1963-03-19 1965-08-31 Beckman Instruments Inc Pipette apparatus
US3590889A (en) * 1969-04-15 1971-07-06 Hamilton Co Injector filling apparatus
SE347355B (en) * 1970-11-12 1972-07-31 Aga Ab
US4091802A (en) * 1976-02-17 1978-05-30 Eastman Kodak Company Vented liquid collection device
USRE33564E (en) * 1981-12-14 1991-04-02 Ballard Medical Products Foam dispensing device
US5339988A (en) 1992-10-19 1994-08-23 Ballard Medical Products Disposable tray sump foamer, assembly and methods

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US194676A (en) * 1877-08-28 Improvement in sewer-traps
US797739A (en) * 1904-07-29 1905-08-22 Wilhelm Meer Valve.
US1594192A (en) * 1925-12-10 1926-07-27 Ross M Turner Vacuum valve
US1742400A (en) * 1926-06-19 1930-01-07 Larsson Johan Georg Separator for cream or similar liquids
US2508793A (en) * 1947-04-05 1950-05-23 Hays Mfg Co Flow control device
US2547377A (en) * 1944-12-19 1951-04-03 Juhasz Kalman John De Check valve device
US2650455A (en) * 1948-02-17 1953-09-01 Union Carbide & Carbon Corp Gas pressure regulator resistant to hum
GB818606A (en) * 1957-04-08 1959-08-19 Gaskell & Chambers Ltd Anti-drip delivery pipes for beer or other pumps
US3112846A (en) * 1959-12-21 1963-12-03 American Can Co Aerosol can package

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US555588A (en) * 1896-03-03 Valve for piping
US2311367A (en) * 1940-04-22 1943-02-16 Laura A Chambers Liquid applicator
US2540360A (en) * 1946-11-12 1951-02-06 George B Ulvild Pipette loader
US2466128A (en) * 1947-03-10 1949-04-05 Roy M Striegel Electrical extension cord assembly
US2655175A (en) * 1947-08-13 1953-10-13 Acme Prot Equipment Company Exhaust valve for gas masks
US2730270A (en) * 1953-06-29 1956-01-10 Harry B Heinemann Liquid measuring and dispensing device
US2728232A (en) * 1953-07-13 1955-12-27 Richard L Costello Pipette filling bulb
US2974528A (en) * 1957-04-11 1961-03-14 Manuel C Sanz Pipette

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US194676A (en) * 1877-08-28 Improvement in sewer-traps
US797739A (en) * 1904-07-29 1905-08-22 Wilhelm Meer Valve.
US1594192A (en) * 1925-12-10 1926-07-27 Ross M Turner Vacuum valve
US1742400A (en) * 1926-06-19 1930-01-07 Larsson Johan Georg Separator for cream or similar liquids
US2547377A (en) * 1944-12-19 1951-04-03 Juhasz Kalman John De Check valve device
US2508793A (en) * 1947-04-05 1950-05-23 Hays Mfg Co Flow control device
US2650455A (en) * 1948-02-17 1953-09-01 Union Carbide & Carbon Corp Gas pressure regulator resistant to hum
GB818606A (en) * 1957-04-08 1959-08-19 Gaskell & Chambers Ltd Anti-drip delivery pipes for beer or other pumps
US3112846A (en) * 1959-12-21 1963-12-03 American Can Co Aerosol can package

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584639A (en) * 1965-06-08 1971-06-15 Gasudarstuenny Nii Orch Polvpr Discrete-operating pneumatic element for logical function
US3889710A (en) * 1972-11-07 1975-06-17 Julien H Brost Check valve with elastomeric valve element
US4718629A (en) * 1985-06-26 1988-01-12 Dr. Ing. Rudolf Hell Gmbh Vacuum holding device
US6371117B1 (en) * 1998-06-15 2002-04-16 Siemens Elema Ab Directional valve
US20090211656A1 (en) * 2008-02-21 2009-08-27 Kao Hsung Tsung Changeover unit for fuel gas pressure reducer

Also Published As

Publication number Publication date
GB953937A (en) 1964-04-02
CH392933A (en) 1965-05-31
DE1498968A1 (en) 1968-11-14
US3118306A (en) 1964-01-21
DE1498968B2 (en) 1971-02-11

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