Optics: measuring and testing – For size of particles – By particle light scattering
Reexamination Certificate
2006-06-16
2009-11-10
Geisel, Kara E (Department: 2877)
Optics: measuring and testing
For size of particles
By particle light scattering
C250S574000
Reexamination Certificate
active
07616310
ABSTRACT:
The present invention provides, for the first time, a process that meets the needs of the drug industry for measuring the particle size of nebulized aerosols simultaneously or one after another by the laser diffraction method and the cascade impactor method which is known in the art. In this way it is possible to bring the reliability of the results of the laser diffraction process according to the invention into conformity with that of the cascade impactor, and thereby obtain a process which combines the advantages of the rapid laser diffraction process with the accuracy of the otherwise time-consuming cascade impactor method. In addition to the process, apparatus for carrying out the process are also disclosed.
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Wachtel Herbert
Ziegler Jochen
Boehringer Ingelheim International GmbH
Devlin Mary-Ellen M.
Geisel Kara E
Kershner David L.
Morris Michael P.
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