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n4freepatentsonline.
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isap:516198916
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The interference particles according to the invention are characterized by a volumetric mean size generally of less than 40 ??m, more particularly less than 30 ??m, especially less than 20 ??m and in particular less than 15 ??m, measured with a laser granulometer, for instance the Mastersizer 2000?? machine from Malvern and the BI90+?? machine from Brookhaven Instrument Corporation.
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