Variable volume pipette

Details Variable volume pipette Variable volume pipette

1985-03-15

1986-06-10

Rolla, Joseph J.

Dispensing

With discharge assistant

With discharge volume varying means

7386417, 239391, 2221445, 222145, G01F 1128

Patent

active

045938377

ABSTRACT:
There is disclosed a pipette useful with disposable tips, comprising a plurality of differently-sized pistons and a piston chamber for each piston. Each piston chamber has a vent passageway extending to the exterior surface of the pipette. The pipette is improved in that the mounting means for mounting a disposable tip comprises, not one surface, but a plurality of differently-sized surfaces. Furthermore, the vent passageway for all but the smallest piston chamber exits at a location in between the mounting surface for the tip of that particular piston chamber and the next smaller mounting surface, whereby the larger disposable tips seal over the vent passageways of the smaller disposable tips.

REFERENCES:
patent: 3131868 (1964-05-01), Coleman
patent: 3640434 (1972-02-01), Walker
patent: 3831618 (1974-08-01), Liston
patent: 4141250 (1979-02-01), D'Autry
patent: 4304138 (1981-12-01), Tervamaki
patent: 4327595 (1982-05-01), Schultz

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