Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1995-05-03
1997-08-26
Pyon, Harold
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
422101, 422104, 7386414, 7386415, 7386401, 436180, B01L 302
Patent
active
056607970
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to laboratory technology and concerns pointed pipette receptacles and their manufacture.
BACKGROUND OF THE INVENTION
Pointed plastic receptacles into which the fluid to be pipetted is drawn have been used by laboratories for a long time in pipettes. This is known already at least in the printed German patent specification 1090449 (date of application Mar. 5, 1957). In the present day there are receptacles by tens of different manufacturers on the market.
All known pointed receptacles are always made of one material.
SUMMARY OF THE INVENTION
It has now been found that a plastic-based pointed receptacle for pipettes can be composed of several materials and that several advantages of various kinds may be achieved in this way.
Some plastic is also preferably used as additional material, though it may also be some other material, such as, for example, metal, glass or rubber.
The intended scope of protection is defined exactly in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention and some advantageous embodiments of the same are described in greater detail in the following. In the drawings
FIG. 1 shows a pointed receptacle;
FIG. 2 is an enlarged top end view of the pointed receptacle of FIG. 1;
FIG. 3 is a top end view of another pointed receptacle;
FIG. 4 is a bottom end view of a pointed receptacle;
FIG. 5 is a top end view of a third pointed receptacle;
FIG. 6 shows a fourth pointed receptacle.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The pointed receptacle according to FIGS. 1 and 2 is manufactured from two separate materials in such a way that the main part of the receptacle consists of some conventional material 1, such as colorless polypropylene, and the top end of the receptacle is provided with a collar made of another material 2.1. The collar may be made of a plastic which is harder or more inflexible than the main body, whereby it will press the mouth tightly against the bottom point of the pipette when the receptacle is pushed into this. The collar may also be only differently colored than the main body of the receptacle, whereby the colored collar may indicate some characteristic of the receptacle, such as size, material, sterility etc.
The receptacle according to FIG. 3 is provided inside at its top end with a collar, which is of a softer material 2.2 than the main body 1 of the receptacle. The collar functions as a seal against the bottom point surface of the pipette.
The receptacle according to FIG. 4 is provided inside at the bottom end with an inner sleeve 2.3, which is of a strongly fluid-repellent material, such as polytetrafluoroethylene. The main body is made of some conventional material. The fluid-repellent bottom end of the receptacle promotes as complete emptying of the receptacle as possible.
The entire inside surface may also be coated with some special plastic or, for example, with metal. In this way e.g. chemical resistance or some other desired property may be obtained.
In the receptacle according to FIG. 5 the entire top end of the receptacle is of another material 2.4 than the main body. The top end material may be softer, for example, to promote sealing. It may be only of a different color to form a code. For example, rings of different colors can be made at suitable intervals over the whole length of the point to indicate different volumes.
The receptacle according to FIG. 6 has an outer receptacle 1.1 and inside this there is a well-like cover 2.5 mounted on radial ribs 3. A magnet 4 is moved inside the cover. A fluid containing magnetic particles is drawn into the outer receptacle. The magnet pulls the particles to the surface of the cover, whereby the fluid free of particles can be removed. Another fluid is drawn into the receptacle and the magnet is moved upwards, whereby the particles are released. To make the separation of particles more efficient, the receptacle 1.1 and the cover 2.5 are of different materials. For example, the cover may be of a suitable paramagnetic material which makes
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Labsystems Oy
Pyon Harold
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