Composition comprising low density microspheres

Drug – bio-affecting and body treating compositions – In vivo diagnosis or in vivo testing – X-ray contrast imaging agent

Reexamination Certificate

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Details

C424S489000, C424S501000, C424S009520, C516S011000, C516S077000, C428S502000

Reexamination Certificate

active

07344705

ABSTRACT:
Low density microspheres, methods for preparing same, and use of same as contrast agents are described. The microspheres have a void 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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