Measuring and testing – Sampler – sample handling – etc. – Plural parallel systems
Patent
1995-03-31
1996-03-12
Noland, Thomas P.
Measuring and testing
Sampler, sample handling, etc.
Plural parallel systems
7386414, 7386417, G01N 114, B01L 302
Patent
active
054976707
ABSTRACT:
A compact, lightweight apparatus for introducing a measured amount of liquid into receptacles positioned in a microtiter plate through disposable pipettes loaded in a sealed manner on the front end of dispensing air cylinders positioned in the apparatus. The pipettes, corresponding in number to the number of cylinders, are positioned in a carrier tray below the cylinders. The carrier tray is moved in an upward direction by another air cylinder with a sufficient loading force such that the pipettes are sealed to the front end of the adjacent cylinder. The loading force is maintained during the entire operating sequence of the apparatus ensuring that the pipette tips always have an effective seal with its cylinder. O-rings positioned in the carrier tray act as individual springs for each of the individual pipette tips to provide a cushioning effect between the pipette and the adjacent cylinder to compensate for molding variations and other dimensional variations in the pipette tips. The pipette tips are removed from the cylinders, when required by the user, by the same assembly that loaded the pipette tips. The pipette loading sequence then can be repeated.
REFERENCES:
patent: 3776700 (1973-12-01), Gallant
patent: 4478094 (1984-10-01), Salomaa et al.
patent: 4555957 (1985-12-01), Frankel et al.
patent: 4936152 (1990-06-01), Aldred
patent: 5021217 (1991-06-01), Oshikubo
patent: 5190727 (1993-03-01), Hirsch
patent: 5226426 (1993-07-01), Yoon
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