Gaseous microparticles for ultrasonic diagnosis and process for their production
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United States of America Patent
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Mar 27, 2001
Grant Date -
N/A
app pub date -
Mar 30, 1999
filing date -
Mar 14, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to gaseous microparticles for ultrasonic diagnosis, whose wall material is built up from block copolymers of polyesters of .alpha.-, .beta.- or .gamma.-hydroxycarboxylic acids with linear or star-shaped polyethylene glycols and optionally liquid crystals or whose wall material is built up from polyesters of .alpha.-, .beta.- or .gamma.-hydroxycarboxylic acids and liquid crystals, media that contain these particles for ultrasonic diagnosis, as well as a process for the production of the media and particles.
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