Multiple port dual diameter pumps

Details Multiple port dual diameter pumps Multiple port dual diameter pumps

2007-04-24

2007-04-24

Gartenberg, Ehud (Department: 3746)

Pumps

Processes

C417S500000, C417S442000

Reexamination Certificate

active

10965287

ABSTRACT:
A multiple port, dual diameter piston fluid dispensing pump which includes multiple input and output ports accessed by rotating at least one of the pistons and a dual or multiple diameter piston or set of pistons that cooperate so that they follow each other. The dispensing piston is of smaller diameter than the pushing piston. This diameter difference permits a longer, controllable stroke to dispense micro-liters of fluid accurately.

REFERENCES:
patent: 4203459 (1980-05-01), Boschung
patent: 4464098 (1984-08-01), Olson
patent: 6244291 (2001-06-01), Hughes
patent: 6511085 (2003-01-01), Sawai
patent: 6666666 (2003-12-01), Gilbert et al.
patent: 6739478 (2004-05-01), Bach et al.
Copending U.S. Appl. No. 10/848,817.

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