Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1997-07-15
1999-01-05
Snay, Jeffrey
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
435809, B65D 8562
Patent
active
058558535
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a petri dish holder, having a basic support that grips the petri dishes on at least part of their circumference.
BACKGROUND OF ART
As a rule, petri dishes are flat plastic dishes with a cover and are used for instance for growing and incubating bacteria and fungus cultures. These cultures are not grown in merely a single petri dish but rather in many such petri dishes, and a number of tests are performed on the cultures in a predetermined order. An important factor is that a predetermined order be adhered to during the entire test procedure, which can take several days. In this time, the petri dishes must be moved constantly back and forth between the incubator and the workspaces, and care must be taken to adhere to the order of the petri dishes, which are typically stacked one above the other. When they are carried about, it is never possible to carry more than only a few of the loosely stacked petri dishes without risk. Since the identification of the dishes is not visible during the entire test procedure, major organizational effort must be expended to keep the individual petri dishes, which as a rule have run through different cycles, in the predetermined workspacedictated order. Particularly whenever fractions need special treatment for further tests, the risk is great that individual petri dishes will be mistaken for one another. Mistakes can slip into the test results in this way. Another major risk is that despite careful handling, the stacked petri dishes can fall over and contaminate the counters or the floor with pathogenic bacteria.
From German Patent DE 43 00 231 C1, petri dishes have been disclosed that are equipped with a special connection unit, so that on the one hand they can be inserted one above the other and on the other can be clamped in a holder and can also be swiveled out of their connection. A disadvantage of these petri dishes has proved that their design is extremely complicated, and even in mass production these petri dishes are therefore relatively expensive.
German Published Patent Application DE 26 28 344 A1 has disclosed a tray for receiving a plurality of petri dishes. Although the petri dishes are retained in a way secure against loss here, nevertheless this tray can hold only a very small number of petri dishes, which are moreover inconvenient to remove from the tray.
European Published Patent Application EP 447 893 A2 has disclosed a holding system for a stack of petri dishes, with which while the stack can be held without difficulty, removing individual petri dishes from the stack is possible, if at all, only with great difficulty.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to furnish a holder for petri dishes that on the one hand holds a large number of such dishes and on the other in which individual dishes or the entire stack can be removed from the holder without difficulty, and moreover the holder is relatively inexpensive and offers protection so that the dishes will not fall out.
In a holder of the type referred to at the outset, this object is attained in accordance with the present invention in that the basic support is embodied with an essentially C-shaped cross section and grips one or more petri dishes, stacked one above the other, over an angle of more than 180.degree. of their circumference.
The essentially C-shaped design has the particular advantage that one or more petri dishes (with covers) can be easily thrust radially into this holder, without having to make special provisions on the holder for retaining or securing the dishes. Above all, this holder need not be either opened or closed, nor must the holder be taken apart or put back together again in order to receive the dishes. In the apparatus of the present invention, a single dish, but as a rule a stack of 21 petri dishes, is thrust all at once radially into the basic support and is circumferentially gripped by it and retained. The circumference of the petri dishes is circumferentially gripped and grippe
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patent: 5747333 (1998-05-01), Jungmann-Campello et al.
Fisher Scientific Catalog, 1983, p.293.
Patent Abstracts of Japan, vol. 12, No. 155 (C-494), 12 May 1988, 62-269757, (Hitachi Electronics Eng Co Ltd.).
Catalogue Sigma--Aldrich Techware, p. 356, Laboratory Equipment and Supplies, 1995-1996.
Zauser Kurt
Zauser Thomas
Orgamed Laborsysteme Vertriebsgesellschaft mbH
Snay Jeffrey
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