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United States of America Patent
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app pub date -
Dec 24, 2002
filing date -
Sep 11, 2001
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Abandoned
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Abstract
The invention relates to a colored lead or a colored chalk with a porous basic lead body, the primary components of which are a filler material and a non-ionic associative thickener, wherein the cavities in the porous basic lead body are filled with a solid or liquid phase.
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