Granted Patent
Utility
US 5,272,909 · App. 07/691,258
Method and device for testing venous valves
Inventors:
Than Nguyen, Aws S. Nashef, Amir H. Abolfathi, David W. Wieting, Denis C. Lee
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Apr 25, 1991
Inventors
Than Nguyen
Aws S. Nashef
Amir H. Abolfathi
David W. Wieting
Denis C. Lee
Assignee (at issue)
Baxter International 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.