US2423173A - Safety pipette - Google Patents

Safety pipette Download PDF

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Publication number
US2423173A
US2423173A US585766A US58576645A US2423173A US 2423173 A US2423173 A US 2423173A US 585766 A US585766 A US 585766A US 58576645 A US58576645 A US 58576645A US 2423173 A US2423173 A US 2423173A
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United States
Prior art keywords
pipette
wall
liquid
safety
safety pipette
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Expired - Lifetime
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US585766A
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Edward L Brady
Lawrence E Glendenin
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    • 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
    • B01L3/0213—Accessories for glass pipettes; Gun-type pipettes, e.g. safety devices, pumps
    • 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

Definitions

  • This invention relates to pipettes and particularly to structural features of pipettes adapted to user to draw liquid into his mouth which result is very undesirable, especially when the liquid is corrosive or radioactive.
  • An object of the invention is to provide a pipette construction which will prevent inadvertent flooding of the mouth of the user.
  • the pipette as shown consists of a suitable intake tube in which may have a calibration mark I I, a mouthpiece l 2 and an intermediate enlarged portion l3 having a part of the wall tom away to show a wall member ii.
  • the wall it is pervious to air, but when wet is not pervious, at least under pressure differences which can be provided by oral suction by laboratory workers.
  • preferably consists of a sintered glass disc sealed in the portion It.
  • the wall I prefertured by Corning has been found to ,be quite'satisfactory.
  • the primary function of the wall is to prevent sudden rushes of-liquid to the mouthpiece i2 and need not provide anabsolute barrier to the passage of a liquid, it will the barrier member is a thin 2 Claims; (Cl. 222-189) 2 be evident that the porosity of the wall It may vary considerably and still perform its protective function.
  • a pipette adapted to pick up liquid by oral suction comprising a tubular member open at both ends and having an'enlarged portion intermediate said ends, and a barrier member within said enlarged portion and having its periphery secured to the wall of said tubular member, said barrier member being pervious to air when .dry and impervious to air and liquid when wet.

Description

July 1947- E. L. BRADY ET AL 2,423,173
. SAFETY PIPETTE Filed March 30, 1945 INVENTOIK Patented 1, 1947 SAFETY PIPE'I'IE Edward L. Brady and Lawrence E. Glendenin,
Oak Ridge, Tenn,
assigllors to United States of America, as represented by the Director of the Oflice of Scientific Research and Development, Ofice for Emergency Management Application March 30, 1945, Serial No. 585,7ii6
This invention relates to pipettes and particularly to structural features of pipettes adapted to user to draw liquid into his mouth which result is very undesirable, especially when the liquid is corrosive or radioactive.
An object of the invention is to provide a pipette construction which will prevent inadvertent flooding of the mouth of the user.
Other objects and advantages of the invention will be evident from the following description when read in connection with the accompanying drawing the single figure of which shows in perspective a pipette incorporating the invention. The pipette as shown consists of a suitable intake tube in which may have a calibration mark I I, a mouthpiece l 2 and an intermediate enlarged portion l3 having a part of the wall tom away to show a wall member ii. In accordance with the invention the wall it is pervious to air, but when wet is not pervious, at least under pressure differences which can be provided by oral suction by laboratory workers. ably consists of a sintered glass disc sealed in the portion It. and the medium grade disc manufac- The wall I prefertured by Corning has been found to ,be quite'satisfactory. Inasmuch as the primary function of the wall is to prevent sudden rushes of-liquid to the mouthpiece i2 and need not provide anabsolute barrier to the passage of a liquid, it will the barrier member is a thin 2 Claims; (Cl. 222-189) 2 be evident that the porosity of the wall It may vary considerably and still perform its protective function.
It will be understood that the invention is not limited in its application to the particular pipette illustrated.
We claim:
1. A pipette adapted to pick up liquid by oral suction comprising a tubular member open at both ends and having an'enlarged portion intermediate said ends, and a barrier member within said enlarged portion and having its periphery secured to the wall of said tubular member, said barrier member being pervious to air when .dry and impervious to air and liquid when wet.
2. A pipette as claimed in claim 1 in which disc of sintered EDWARD L. BRADY. LAWRENCE E. GLENDENDJ'.
REFERENCES CITED The following references are of record in the glass.
file of this patent: I
25 UNITED STATES PATENTS Number Name Date 2,376,231 Cohn May 15, 1945 2,114,748 Prausnitz Apr, 19, 1938 Luertzing Nov. 8,1938
US585766A 1945-03-30 1945-03-30 Safety pipette Expired - Lifetime US2423173A (en)

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US2423173A true US2423173A (en) 1947-07-01

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634028A (en) * 1947-12-31 1953-04-07 Bell Telephone Labor Inc Mercury dispenser
US2635784A (en) * 1950-05-11 1953-04-21 Horace L Bering Vent plug closure
US2685800A (en) * 1952-11-12 1954-08-10 Kopp Scient Inc Pipet for microanalysis
US2720109A (en) * 1951-01-13 1955-10-11 American Cyanamid Co Powder density determination
US3033420A (en) * 1959-11-02 1962-05-08 Betty S Thomas Method and apparatus for dispensing liquids
US3124828A (en) * 1964-03-17 Liquid impermeable vent
US3125255A (en) * 1964-03-17 Kaiser
US3134512A (en) * 1961-07-25 1964-05-26 Beckman Instruments Inc Dispensing apparatus
US3215500A (en) * 1961-06-12 1965-11-02 Donald L Bittner Laboratory mixer-separator
US3315844A (en) * 1965-01-13 1967-04-25 Air Prod & Chem Dispensing apparatus
US3864979A (en) * 1973-03-30 1975-02-11 Becton Dickinson Co Blood sedimentation tube barrier
US3865549A (en) * 1971-10-07 1975-02-11 Wellcome Found Auto-analytical apparatus and analytical methods
US3891392A (en) * 1972-07-04 1975-06-24 Peter Alan Betts Method of maintaining a column of liquid within an open-ended tube, and a tube device for carrying out the method
US3912129A (en) * 1974-09-30 1975-10-14 Hughes Aircraft Co Liquid dispenser
US4210156A (en) * 1978-04-24 1980-07-01 Bennett Elmer T Finger stick blood collection apparatus
US4267729A (en) * 1979-05-14 1981-05-19 Eddelman Roy T Volumetric pipettor
US4350049A (en) * 1979-11-09 1982-09-21 Boehringer Ingelheim Gmbh Device and process for drawing off very small quantities of powder
US4378333A (en) * 1980-12-11 1983-03-29 Laipply Thomas C Device for preparing blood smears on glass slides and method therefor
US5059398A (en) * 1985-07-22 1991-10-22 Drummond Scientific Company Disposable preselected-volume capillary pipet device
US5058441A (en) * 1989-12-18 1991-10-22 The United States Of America As Represented By The Department Of Health And Human Services Safety pipette and adaptor tip
US5114679A (en) * 1990-08-27 1992-05-19 Eastman Kodak Company Method of using a pipette
US5209128A (en) * 1989-12-18 1993-05-11 The United States Of America As Represented By The Department Of Health And Human Services Safety pipette and adaptor tip
US5217693A (en) * 1990-05-29 1993-06-08 Mark Anderson Embryo washing apparatus and process
US5437979A (en) * 1989-07-24 1995-08-01 Beckman Instruments, Inc. Solid phase system for sequential reactions
US5580529A (en) * 1994-04-22 1996-12-03 Bio-Plas, Inc. Aerosol and liquid transfer resistant pipette tip apparatus
US6343717B1 (en) * 2000-11-21 2002-02-05 Jack Yongfeng Zhang Pre-filled disposable pipettes
US6803021B1 (en) * 1998-04-03 2004-10-12 November Ag Novus Medicatus Bertling Gesellschaft Fur Molekulare Medizin Device for receiving and discharging a given amount of liquid
US8668552B2 (en) * 2006-06-13 2014-03-11 Boaz Barry Groman Methods of making micro-abrasive blasting device for dental applications

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114748A (en) * 1934-05-09 1938-04-19 Firm Jenaer Glaswerk Schott & Method of making porous filter bodies of particles of glass
US2136170A (en) * 1936-12-15 1938-11-08 Ace Glass Inc Glass filter
US2376231A (en) * 1942-02-12 1945-05-15 David J Cohn Pipette

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114748A (en) * 1934-05-09 1938-04-19 Firm Jenaer Glaswerk Schott & Method of making porous filter bodies of particles of glass
US2136170A (en) * 1936-12-15 1938-11-08 Ace Glass Inc Glass filter
US2376231A (en) * 1942-02-12 1945-05-15 David J Cohn Pipette

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124828A (en) * 1964-03-17 Liquid impermeable vent
US3125255A (en) * 1964-03-17 Kaiser
US2634028A (en) * 1947-12-31 1953-04-07 Bell Telephone Labor Inc Mercury dispenser
US2635784A (en) * 1950-05-11 1953-04-21 Horace L Bering Vent plug closure
US2720109A (en) * 1951-01-13 1955-10-11 American Cyanamid Co Powder density determination
US2685800A (en) * 1952-11-12 1954-08-10 Kopp Scient Inc Pipet for microanalysis
US3033420A (en) * 1959-11-02 1962-05-08 Betty S Thomas Method and apparatus for dispensing liquids
US3215500A (en) * 1961-06-12 1965-11-02 Donald L Bittner Laboratory mixer-separator
US3134512A (en) * 1961-07-25 1964-05-26 Beckman Instruments Inc Dispensing apparatus
US3315844A (en) * 1965-01-13 1967-04-25 Air Prod & Chem Dispensing apparatus
US3865549A (en) * 1971-10-07 1975-02-11 Wellcome Found Auto-analytical apparatus and analytical methods
US3891392A (en) * 1972-07-04 1975-06-24 Peter Alan Betts Method of maintaining a column of liquid within an open-ended tube, and a tube device for carrying out the method
US3864979A (en) * 1973-03-30 1975-02-11 Becton Dickinson Co Blood sedimentation tube barrier
US3912129A (en) * 1974-09-30 1975-10-14 Hughes Aircraft Co Liquid dispenser
US4210156A (en) * 1978-04-24 1980-07-01 Bennett Elmer T Finger stick blood collection apparatus
US4267729A (en) * 1979-05-14 1981-05-19 Eddelman Roy T Volumetric pipettor
US4350049A (en) * 1979-11-09 1982-09-21 Boehringer Ingelheim Gmbh Device and process for drawing off very small quantities of powder
US4378333A (en) * 1980-12-11 1983-03-29 Laipply Thomas C Device for preparing blood smears on glass slides and method therefor
US5059398A (en) * 1985-07-22 1991-10-22 Drummond Scientific Company Disposable preselected-volume capillary pipet device
US5437979A (en) * 1989-07-24 1995-08-01 Beckman Instruments, Inc. Solid phase system for sequential reactions
US5209128A (en) * 1989-12-18 1993-05-11 The United States Of America As Represented By The Department Of Health And Human Services Safety pipette and adaptor tip
US5058441A (en) * 1989-12-18 1991-10-22 The United States Of America As Represented By The Department Of Health And Human Services Safety pipette and adaptor tip
US5217693A (en) * 1990-05-29 1993-06-08 Mark Anderson Embryo washing apparatus and process
US5114679A (en) * 1990-08-27 1992-05-19 Eastman Kodak Company Method of using a pipette
US5580529A (en) * 1994-04-22 1996-12-03 Bio-Plas, Inc. Aerosol and liquid transfer resistant pipette tip apparatus
US6803021B1 (en) * 1998-04-03 2004-10-12 November Ag Novus Medicatus Bertling Gesellschaft Fur Molekulare Medizin Device for receiving and discharging a given amount of liquid
US6343717B1 (en) * 2000-11-21 2002-02-05 Jack Yongfeng Zhang Pre-filled disposable pipettes
US8668552B2 (en) * 2006-06-13 2014-03-11 Boaz Barry Groman Methods of making micro-abrasive blasting device for dental applications

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