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Publication numberUS1662682 A
Publication typeGrant
Publication dateMar 13, 1928
Filing dateMar 29, 1926
Priority dateMar 29, 1926
Publication numberUS 1662682 A, US 1662682A, US-A-1662682, US1662682 A, US1662682A
InventorsLloyd John Uri
Original AssigneeLloyd John Uri
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Medicine dropper or syringe
US 1662682 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

March 13, 1928. 1,662,682


v 2 11 f oz (John Uri Llgyd,

Patented Mar. 13, 1928.



Application filed March 29, 1926. Serial No. 98,068.

My invention relates to devices generally referred to as medicine dropp-ers or syringes and comprising a tubular glass member reduced at its one end, and provided at its other end with an elastic cap, generally made of rubber for exhausting the tube.

An object of my invention is to provide a device wherein there is eliminated the uncertainty of dose incident to the present type of dropper occasioned by the reduced blunt discharge end of the tube. In the present type of dropper, the reduced end of the glass tube must be sufficiently small to prevent the escape of fluid from the reduced end of the tube when said end is lowermost. Because of this fact, it is extremely difiicult to accurately discharge drops of uniform size and to avoid loss or misplacement of discharged drops incident to any slight nervousness or unexpected movement of the operator.

An object of my invention is to provide a tubular member of such structure that the form of the discharge end thereof will serve to assemble a minim or one-sixtieth (1/60) part of a fluid dram at the end of the dropper whereby compression of the rubber like cap serves merely to discharge a drop rather ghan to both form and discharge a drop of uid.

These and other objects are attained by the means described herein, and disclosed in the accompanying drawings, in which:

Fig. 1 is a view showing a medicine dropper embodying my invention.

Figs. 2, 3 and 4 are views similar to Fig. 1, showing slightly modified forms of a dropper.

Fig. 5 is an enlarged sectional view on line 5-5 of Fig. l.

Generally my invention comprises the provision of a flared or funnel shaped coni cal end 10 formed upon the reduced port-ion ll of. the tube 12. In practice, tubes such as 12 are made of glass. A cap 13 is provided, said cap being of an elastic or resilient material, for example, rubber, whereby the tube may be exhausted both before conditioning the same for causing fluid to enter the tube,

and for administering fluid from within the tube.

In the devices as shown in Figs. 2 and 3, the flared ends 14 and 15 are made slightly larger relative to the reduced portions 16 and 17 respectively of the tubes 18 and 19 respectively.

In Figs; 4 and 5, the discharge end of the tube 20 is enlarged or provided with an annular flange like structure 21, of such size and shape that substantially a drop or a minim, or one-sixtieth (1/60) part of a fluid dram will be held thereby preparatory to discharge therefrom upon application of pressure to the flexible cap.

It is to be noted that in all of the forms disclosed herein, there is provided a reduced portion 23 in each of the tubes adjacent the discharge ends thereof, this reduced portion serving the same purpose as the reduced portion of droppers commonly used heretofore, viz, by providing .such a small cross sectional opening into the tube, capillary attraction will suflice to preclude flow of fluid from the tube except as discharged therefrom by manipulation of the cap. By providing the enlarged or flared end upon the tube outwardly from the restricted portion 23, the fluid may pass to the flared portion of the dropper but will not leave the dropper until the cap is manipulated.

Although I do not fully understand why the structure as described accomplishes the results stated, I believe the proper theory is that in order for a drop or minim to leave the flared end of the dropper, it is necessary to overcome the natural abhorrence of l nature to-a vacuum that would tend toward creation should the drop leave the flared end of the dropper, the capillary attraction of the fluid at the reduced portion of the droppetl; serving to preclude entry of air into the to e.

What I claim is:

1. A dropper or syringe comprising a tubular member, means at one end of said member for exhausting air therefrom for the purpose of introducing a liquid into the tubular member, an enlarged cup-like member at the opposite end of the tube and a reduced portion in the tubular member intermediate the cup-like portion and the body thereof providing a restricted passage of a size such that capillary attraction of the fluid in the reduced portion of the tube will prefor a dropper-comprising ntubularmember and provided adjacent its one end with a reduced bore, said end being enlarged and extended to provide a cup with an enlarged month, said cup being adapted to separate and retain :1 predetermined quantity offluid from a body of fluid Withinthe tube.

3. As a new article of manufacture, -& dropper comprising a collapsible member and a tubular menibcrnttached to theieollupsiblejmeniber nt its one end and provided adjacent itsooppositerend with a reduced bore, said last mentioned end being enlarged and extendedtoproviden cup with an enlarged mouth, Rilld cup, when inverted be in g adapted to hold, by adhesion, a minim of ordinary liquid and to discharge the coin tents of tl1e cnp.-like portion upon actuation of the collapsible member.

In testimony whereof, 1 have hereunto subscribed my name this 25th day of lil'urch, 1926. i


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3276847 *Sep 8, 1964Oct 4, 1966Cooke Engineering CompanyTubular dropper for micro-titration
US5246145 *Feb 26, 1992Sep 21, 1993Nalge CompanyLiquid dropper spout having lockable pivoted closure cap
US5328058 *Sep 8, 1993Jul 12, 1994Nalge CompanyDropper bottle assembly with squeeze cap
US7182915 *Nov 27, 2002Feb 27, 2007Bristol-Myers Squibb CompanyPipette configurations and arrays thereof for measuring cellular electrical properties
US20030132109 *Nov 27, 2002Jul 17, 2003Andrew BullenPipette configurations and arrays thereof for measuring cellular electrical properties
US20090101681 *Oct 10, 2008Apr 23, 2009Remedios DatoLiquid Dispensing Tip With Reservoir
EP2050501A1 *Oct 17, 2008Apr 22, 2009Lifescan Scotland LtdLiquid dispensing tip with reservoir
WO2009052243A1 *Oct 16, 2008Apr 23, 2009Lifescan Scotland, LtdLiquid dispensing tip with reservoir
U.S. Classification604/217, 422/930, 604/275, 604/207
International ClassificationB01L3/02
Cooperative ClassificationB01L2400/0481, B01L3/0272
European ClassificationB01L3/02D12