Contrast agent comprising low density microspheres
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United States of America Patent
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Aug 10, 2004
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N/A
app pub date -
Oct 25, 2002
filing date -
Apr 5, 1991
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Expired
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Abstract
Low density microspheres, methods for preparing same, and use of same as contrast agents are described. The microspheres have a void having a volume that comprises at least about 75% of the total volume of the microspheres, and which contains a gas or the vapor of a volatile liquid selected from the group consisting of aliphatic hydrocarbons, chlorofluorocarbons, tetraalkyl silanes and perfluorocarbons.
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