Granted Patent
Utility
US 4,828,772 · App. 07/192,595
Microporous membranes of ultrahigh molecular weight polyethylene
Inventors:
George Lopatin, Larry Y. Yen
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: May 9, 1988
Inventors
George Lopatin
Larry Y. Yen
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.