Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Reexamination Certificate
2008-07-08
2008-07-08
Gordon, Brian R. (Department: 1797)
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
C073S864000, C073S863320, C073S863830, C073S863720, C073S864010, C073S864110, C073S864150
Reexamination Certificate
active
07396512
ABSTRACT:
A rugged, all-electronic fluid dispensing system for use with pipettes or in other contexts indirectly measures fluid flow by using a non-linear system model to correlate vacuum existing at the top of a column of suspended fluid. Non-contact operation is provided to eliminate the need for contact-type closed-loop fluid flow sensing and associated potential cross-contamination risks. In one particular exemplary non-limiting illustrative implementation, an electronic controller within a gun-shaped, cordless self-contained pipetter housing dynamically calculates valve opening time based on a non-linear equation. Calibration is used to derive equation constants, and column vacuum pressure before the valve is opened is used as the independent variable to derive a valve opening time that will result in accurate dispensing of a desired programmed fluid quantity. Repetitive automatic dispensing with accuracies greater than 1% are possible within the context of a relatively inexpensive portable pipette or device without the need for mechanically-complex positive displacement arrangements.
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Canfield Eric L.
DiTrolio Nicholas M.
Drummond Scientific Company
Gordon Brian R.
Nixon & Vanderhye PC
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