Granted Patent
Utility
US 6,620,404 · App. 09/670,894
Gaseous ultrasound contrast media and method for selecting gases for use as ultrasound contrast media
Inventor:
Steven C. Quay
Patented Case
View Patent ↗
Granted: Sep 16, 2003
Filed: Sep 28, 2000
Inventor
Steven C. Quay
Assignee (at issue)
Amersham Health AS
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.