Granted Patent
Utility
US 4,874,567 · App. 07/042,138
Microporous membranes from polypropylene
Inventors:
George Lopatin, Larry Y. Yen, Randall R. Rogers
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Apr 24, 1987
Inventors
George Lopatin
Larry Y. Yen
Randall R. Rogers
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.