Optics: measuring and testing – With plural diverse test or art
Reexamination Certificate
2007-01-16
2008-11-18
Geisel, Kara E (Department: 2877)
Optics: measuring and testing
With plural diverse test or art
C356S336000
Reexamination Certificate
active
07453556
ABSTRACT:
The measurement of the particle size distribution of an aerosol is of crucial importance in pharmaceutical development. A prerequisite for this is a valid method, e.g. the cascade impactor method described in the pharmacopoeias. It requires measurement of the active substance concentration in order to determine the particle size distribution. The invention provides a process which makes it possible to measure the size of aerosol droplets containing pharmaceutical substances which are unstable in the event of changes in the pH.
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Boeck Georg
Hochrainer Dieter
Hoelz Hubert
Kreher Christoph
Scheffler Christian
Boehringer Ingelheim International GmbH
Devlin Mary-Ellen M.
Geisel Kara E
Kershner David L.
Morris Michael P.
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