Granted Patent
Utility
US 5,547,656 · App. 08/449,090
Low density microspheres and their use as contrast agents for computed tomography, and in other applications
Inventor:
Evan C. Unger
Patented Case
View Patent ↗
Granted: Aug 20, 1996
Filed: May 24, 1995
Inventor
Evan C. Unger
Assignee (at issue)
ImaRx Pharmaceutical Corp.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.