Pumps – Condition responsive variable volumetric capacity expansible...
Reexamination Certificate
2006-11-20
2011-10-04
Freay, Charles (Department: 3746)
Pumps
Condition responsive variable volumetric capacity expansible...
C417S212000, C222S061000, C222S063000
Reexamination Certificate
active
08029247
ABSTRACT:
Systems and methods for maintaining substantially a baseline pressure in a chamber of a pumping apparatus are disclosed. Embodiments of the present invention may serve to control a motor to compensate or account for a pressure drift which may occur in a chamber of the pumping apparatus. More specifically, a dispense motor may be controlled to substantially maintain a baseline pressure in the dispense chamber before a dispense based on a pressure sensed in the dispense chamber. In one embodiment, before a dispense is initiated a control loop may be utilized such that it is repeatedly determined if the pressure in the dispense chamber is above a desired pressure and, if so, the movement of the pumping means regulated to maintain substantially the desired pressure in the dispense chamber until a dispense of fluid is initiated.
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Cedrone James
Gonnella George
Entegris, Inc.
Freay Charles
Hamo Patrick
Sprinkle IP Law Group
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