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Publication numberUS1634183 A
Publication typeGrant
Publication dateJun 28, 1927
Filing dateOct 18, 1926
Priority dateOct 18, 1926
Publication numberUS 1634183 A, US 1634183A, US-A-1634183, US1634183 A, US1634183A
InventorsMaurille Gervais, Wilfred Biron
Original AssigneeMaurille Gervais, Wilfred Biron
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1634183 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

June 28 1927.

M. GERVAiS ET AL PIPETTE Filed Oct. 18, 1925 fl/auriZZe aerwa P/ZZjfd B INVENTORa ATTOR N EY WITNESS:

Patented June 28, 1927.



Application filed October 18, 1926.

The object of this invention is to provide a device for laboratory use under usual conditions, but having a silver or other form of metallic tip or cap, preferably ct cone shape, and adapted to fit over the lower end of the instrument, so that when inserted into he liquid it will not be fractured by contact with the bottom of the receptacle.

A further object is to provide a tip of the kind indicated, which shall have an internal screw thread for engagement with an eXter-' nal thread on the end of the tip, the tip being adapted to fit tubes of different sizes.

With the foregoing and other objects in view, the invention consists in the novel construction and arrangement of elements de scribed, illustrated and claimed, it being understood that modifications may be made within the scope of the claims without departing from the spirit of the invention.

In the drawings forming part of this application,

Figure 1 is a view of a pipette in elevation, with the tip or cap applied thereto.

Figure 2 is a fragmentary view showing the tip in longitudinal section and the end of the tube in elevation.

A pipette of ordinary commercial type is designated 10, and includes a tapered or cone-shaped end 11, which may be externally threaded as shown at 12.

A. metallic cap 14 to be made preferably of silver, is of cone shape and includes a nozzle portion 15. Internal threads 16 in the cap cooperate with the threads 12 on the tube. and the cap is thereby detachably re Serial No. 142,408.

tained, and may be applied to other tubes when desired, even though they may be of diiierent sizes, provided only that the threads of the tube to be employed properly engage the threads of the cone-shaped cap or tip.

The instrument to which the cap is applied, is thus protected from fracture by direct contact between the lower end and the bottom or a container or the like, and the tip may be used as a nozzle for transferring the liquid withdrawn to another tube or container.

Having described the invention what is claimed is 1. The combination with a tube having a tapered end, of a cone-shaped cap connected with the tapered end and having a discharge nozzle portion.

2. The combination with a tube including a tapered end portion, this portion being eX- ternally threaded, of a cone-shaped cap internally threaded and connected with the tapered end portion of the tube.

3. The combination with a graduated tube having a tapered end portion, this portion including engaging means, of a cap fitting the tapered end ot the tube and including engaging means cooperating with those first named, the free end of the cap including a nozzle portion.

In testimony whereof we a' tures.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2535437 *Nov 25, 1949Dec 26, 1950Pfaudler Co IncDip pipe for processing containers
US3500689 *Mar 18, 1968Mar 17, 1970American Hospital Supply CorpPipette construction
US4748859 *Mar 6, 1987Jun 7, 1988Rainin Instrument Co., Inc.Disposable pipette tip
US6225128 *Feb 19, 1999May 1, 2001Wrs And AssociatesColor test card package for testing for the presence of lead
US7641859Jan 5, 2010Matrix Technologies CorporationPipette tip mounting and ejection assembly and associated pipette tip
US8163256Apr 24, 2012Matrix Technologies CorporationPipette tip mounting and ejection assembly and associated pipette tip
US20050175511 *Nov 18, 2004Aug 11, 2005Cote Richard A.Pipette tip mounting and ejection assembly and associated pipette tip
US20090280033 *Jul 27, 2009Nov 12, 2009Matrix Technologies CorporationPipette Tip Mounting And Ejection Assembly And Associated Pipette Tip
U.S. Classification73/864.1, 141/110, 422/922
International ClassificationB01L3/02
Cooperative ClassificationB01L3/021
European ClassificationB01L3/02C