US 6,398,513 B1Granted

Fluid dispensers

AssigneesFluid Management, Inc., Micropump, Inc.

InventorsThomas J. Amsler, Tim Hogan, Margaret M. Lowan, James Martin, William A. Miller, Susan G. McDermott, Jeffrey G. Barton, Charles F. Carr

Life of this patent

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Abstract

A fluid dispense system having a computer control system that operatively controls a stepper motor driving a nutating pump. The stepper motor actuates the nutating pump piston through partial revolutions. The computer control system determines the number of stepper motor steps required to pump a desired amount of fluid by the nutating pump by rotating the piston through segments which are less than a full revolution.

Claims12

Dependent claims

A fluid dispenser comprising:

a source of fluid;
a fluid pump having a rotating and reciprocating piston in a pump housing, the pump housing having an inlet fluidly connected to the source of fluid and an outlet;
a motor engaged with the fluid pump;
and
a controller operatively connected to the motor the controller having a plurality of output signals, the motor and piston having predetermined rotational positions in response to the plurality of output signals, at least one rotational position of the piston being less than a full revolution of the piston.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/665,695Filed 20 Sep 2000
Granted: 4 Jun 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G01F 11/021
With measuring chambers which expand or contract during measurement: of the piston type
G01F 11/029
Of the piston type: provided with electric controlling means
G01F 11/20
Of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements: wherein the measuring chamber rotates or oscillates
G01F 11/22
Wherein the measuring chamber rotates or oscillates: for liquid or semiliquid

Family

No related US applications are recorded in the indexed filing history.

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