|Publication number||US2423173 A|
|Publication date||Jul 1, 1947|
|Filing date||Mar 30, 1945|
|Priority date||Mar 30, 1945|
|Publication number||US 2423173 A, US 2423173A, US-A-2423173, US2423173 A, US2423173A|
|Inventors||Edward L Brady, Lawrence E Glendenin|
|Original Assignee||Edward L Brady, Lawrence E Glendenin|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (28), Classifications (13) |
|External Links: USPTO, USPTO Assignment, Espacenet|
US 2423173 A
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.
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
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2114748 *||May 2, 1935||Apr 19, 1938||Firm Jenaer Glaswerk Schott &||Method of making porous filter bodies of particles of glass|
|US2136170 *||Dec 15, 1936||Nov 8, 1938||Ace Glass Inc||Glass filter|
|US2376231 *||Feb 12, 1942||May 15, 1945||David J Cohn||Pipette|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2634028 *||Dec 31, 1947||Apr 7, 1953||Bell Telephone Labor Inc||Mercury dispenser|
|US2635784 *||May 11, 1950||Apr 21, 1953||Bering Horace L||Vent plug closure|
|US2685800 *||Nov 12, 1952||Aug 10, 1954||Kopp Scient Inc||Pipet for microanalysis|
|US2720109 *||Jan 13, 1951||Oct 11, 1955||American Cyanamid Co||Powder density determination|
|US3033420 *||Nov 2, 1959||May 8, 1962||Gwinn Mabel C||Method and apparatus for dispensing liquids|
|US3124828 *||Dec 5, 1961||Mar 17, 1964|| ||Liquid impermeable vent|
|US3125255 *||May 29, 1961||Mar 17, 1964|| ||Kaiser|
|US3134512 *||Jul 25, 1961||May 26, 1964||Beckman Instruments Inc||Dispensing apparatus|
|US3215500 *||Jun 12, 1961||Nov 2, 1965||Donald L Bittner||Laboratory mixer-separator|
|US3315844 *||Jan 13, 1965||Apr 25, 1967||Air Prod & Chem||Dispensing apparatus|
|US3864979 *||Mar 30, 1973||Feb 11, 1975||Becton Dickinson Co||Blood sedimentation tube barrier|
|US3865549 *||Oct 2, 1972||Feb 11, 1975||Wellcome Found||Auto-analytical apparatus and analytical methods|
|US3891392 *||Jan 24, 1973||Jun 24, 1975||Peter Alan Betts||Method of maintaining a column of liquid within an open-ended tube, and a tube device for carrying out the method|
|US3912129 *||Sep 30, 1974||Oct 14, 1975||Hughes Aircraft Co||Liquid dispenser|
|US4210156 *||Apr 24, 1978||Jul 1, 1980||Bennett Elmer T||Finger stick blood collection apparatus|
|US4267729 *||May 14, 1979||May 19, 1981||Eddelman Roy T||Volumetric pipettor|
|US4350049 *||Nov 5, 1980||Sep 21, 1982||Boehringer Ingelheim Gmbh||Device and process for drawing off very small quantities of powder|
|US4378333 *||Dec 11, 1980||Mar 29, 1983||Laipply Thomas C||Device for preparing blood smears on glass slides and method therefor|
|US5058441 *||Dec 18, 1989||Oct 22, 1991||The United States Of America As Represented By The Department Of Health And Human Services||Safety pipette and adaptor tip|
|US5059398 *||Jul 22, 1985||Oct 22, 1991||Drummond Scientific Company||Free passage of air; venting; sample chamber defined by barrier plug; capillary flow; wets plug; discharges|
|US5114679 *||Aug 27, 1990||May 19, 1992||Eastman Kodak Company||Withdrawal of fluid sample, aspiration and measurement, unfolding, inversion and releasing|
|US5209128 *||Dec 18, 1990||May 11, 1993||The United States Of America As Represented By The Department Of Health And Human Services||Safety pipette and adaptor tip|
|US5217693 *||May 29, 1990||Jun 8, 1993||Mark Anderson||Simple, disposable equipment requiring a minimal number of steps|
|US5437979 *||Aug 24, 1992||Aug 1, 1995||Beckman Instruments, Inc.||Immobilizing on support located inside the tip of a pipette; automated; programmable; time reduction; uniformity|
|US5580529 *||Jun 12, 1995||Dec 3, 1996||Bio-Plas, Inc.||Aerosol and liquid transfer resistant pipette tip apparatus|
|US6343717 *||Nov 21, 2000||Feb 5, 2002||Jack Yongfeng Zhang||Pre-filled disposable pipettes|
|US6803021 *||Mar 31, 1999||Oct 12, 2004||November Ag Novus Medicatus Bertling Gesellschaft Fur Molekulare Medizin||Device for receiving and discharging a given amount of liquid|
|US8668552 *||Feb 22, 2013||Mar 11, 2014||Boaz Barry Groman||Methods of making micro-abrasive blasting device for dental applications|