Self-cleaning pipette tips

Details Self-cleaning pipette tips Self-cleaning pipette tips

1991-06-19

1992-11-03

Noland, Tom

Measuring and testing

Sampler, sample handling, etc.

Capture device

7386414, B01L 302

Patent

active

051598426

ABSTRACT:
There are disclosed pipette tips having a wettable exterior surface shaped to force liquid that wets it to not fall under the influence of gravity to the terminal surface at which the dispensing aperture is located. For this, the radius R.sub.o of that wettable surface at the terminal surface satisfies the equation (I) R.sub.o <(.sigma./.rho.g).sup.1/2 and the slope of the wettable surface satisfies the equation (II) dz/dr<(.sigma..sup.2 /(.rho.gr.sup.2).sup.2 -1).sup.1/2 where dz/dr is the rate of change in the height per the rate of change of distance from the axis of symmetry of the tip.

REFERENCES:
patent: Re27637 (1973-05-01), Roach
patent: 2946486 (1960-07-01), Gilmont
patent: 3040931 (1962-06-01), Sanz
patent: 3175734 (1965-03-01), Heiss
patent: 3177723 (1965-04-01), Pedersen
patent: 3258972 (1966-07-01), Cassaday et al.
patent: 3500689 (1970-03-01), Band
patent: 4347875 (1982-09-01), Columbus
patent: 4905526 (1990-03-01), Magnussen, Jr. et al.

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