Bead manipulating chucks with bead size selector

Details Bead manipulating chucks with bead size selector Bead manipulating chucks with bead size selector

1998-03-25

1999-11-23

Noland, Kenneth W.

Article dispensing

With discharge assistant

Article adhering or gripping type

2091271, B23Q 704

Patent

active

059884320

ABSTRACT:
Bead manipulating chucks for selective pick up and discharge of polymer beads for chemical synthesis or analysis, whereby bead collection zones are recessed from bead contact surfaces. The strong dependence of the electrostatic image force on bead overall diameters provides a mechanism that sharply selects bead sizes that are successfully attracted and retained by the bead manipulating chuck. In this way, the bead manipulating chuck acts as an electrical analog to a low pass filter, only attracting and retaining beads of an overall diameter lower than a selected value.

REFERENCES:
patent: 4113142 (1978-09-01), Ryzhov et al.
patent: 4153151 (1979-05-01), Kulberg et al.
patent: 5292029 (1994-03-01), Pearson

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