Granted Patent
Utility
US 6,315,981 · App. 09/272,468
Gas filled microspheres as magnetic resonance imaging contrast agents
Inventor:
Evan C. Unger
Patented Case
View Patent ↗
Granted: Nov 13, 2001
Filed: Mar 19, 1999
Inventor
Evan C. Unger
Assignee (at issue)
ImaRx Therapeutics, Inc.
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.