Granted Patent
Utility
US 5,769,080 · App. 08/199,462
Gas filled liposomes and stabilized gas bubbles and their use as ultrasonic contrast agents
Inventors:
Evan C. Unger, Guanli Wu
Patented Case
View Patent ↗
Granted: Jun 23, 1998
Filed: Feb 22, 1994
Inventors
Evan C. Unger
Guanli Wu
Assignee (at issue)
The DuPont Merck Pharmaceutical Company
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.