Method of making polymeric gas or air filled microballoons for ultrasonic echography
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United States of America Patent
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Jan 27, 1998
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app pub date -
Aug 10, 1994
filing date -
May 18, 1990
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Abstract
Method of making gas or air filled microballoons having a mean size in the range of 0.5 to 1000 microns bounded by a 50 to 500 nm thick biodegradable, interfacially deposited, synthetic polymer membrane which is deformable and resilient for use in ultrasonic contrast compositions are described.
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