Granted Patent
Utility
US 5,562,893 · App. 08/284,782
Gas-filled microspheres with fluorine-containing shells
Inventor:
Rolf Lohrmann
Patented Case
View Patent ↗
Granted: Oct 8, 1996
Filed: Aug 2, 1994
Inventor
Rolf Lohrmann
Assignee (at issue)
Molecular Biosystems, 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.