Granted Patent
Utility
US 4,997,577 · App. 07/453,952
Systems and methods for removing undesired matter from blood cells
Inventor:
Mary A. Stewart
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Dec 20, 1989
Inventor
Mary A. Stewart
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.