Granted Patent
Utility
US 4,824,568 · App. 06/864,074
Composite ultrafiltration membranes
Inventors:
Anthony E. Allegrezza, Jr., Edmund T. Burke
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: May 16, 1986
Inventors
Anthony E. Allegrezza, Jr.
Edmund T. Burke
Assignee (at issue)
Millipore Corporation
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.