Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2007-04-17
2007-04-17
Hirshfeld, Andrew H. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S689000
Reexamination Certificate
active
10905875
ABSTRACT:
An apparatus and method for determining and monitoring the moisture content of an elastomer material used as a closure or stopper for containers holding lyophilized pharmaceutical products, comprising a parallel capacitance circuit formed by supplying a source of AC voltage to a reference elastomer closure and a sample elastomer closure. The capacitance of the sample elastomer closure is measured and compared with the capacitance of the reference elastomer closure. The difference in capacitances of the sample elastomer closure and the reference elastomer closure allow the absorbed moisture content of the sample closure to be determined or monitored. The method does not require destruction of the sample elastomer closure, and can be used to rapidly determine moisture content under normal storage conditions or at elevated or lower temperatures.
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Dole Timothy J.
Hirshfeld Andrew H.
Malin Haley & DiMaggio, P.A.
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