Chemistry: analytical and immunological testing – Determination of water
Reexamination Certificate
2002-08-20
2008-09-02
Wallenhorst, Maureen M (Department: 1797)
Chemistry: analytical and immunological testing
Determination of water
C436S008000, C436S042000, C436S161000, C436S174000, C436S175000, C436S177000, C436S178000, C422S068100, C422S069000, C422S089000, C422S105000, C210S656000
Reexamination Certificate
active
07419831
ABSTRACT:
A method for calibrating an analysis instrument, e.g., a gas chromatograph, for water analysis that includes four steps. The first step is to continuously remove water from a liquid that contains water to produce a liquid containing a reduced amount of water such as by membrane pervaporation. The second step is to analyze the liquid containing a reduced amount of water for water by a reference water analysis method such as by Karl Fischer titration. The third step is to analyze the stream of liquid containing a reduced amount of water using the instrument to be calibrated, e.g., a gas chromatograph having a helium photoionization pulse discharge detector. The fourth step is to calibrate the instrument using the analysis of the second step. In a related embodiment, a system for normal phase chromatography.
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Beach Mark William
Dittenhafer Mark Lindsay
Erskine Steven Randall
Frawley Nile Nelson
Kiefer Joseph J.
Dow Global Technologies Inc.
Wallenhorst Maureen M
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