Granted Patent
Utility
US 5,885,456 · App. 08/689,549
Polysulfone copolymer membranes and process
Inventors:
John Charkoudian, Anthony E. Allegrezza, Jr.
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Aug 9, 1996
Inventors
John Charkoudian
Anthony E. Allegrezza, Jr.
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.