Granted Patent
Utility
US 5,487,771 · App. 08/281,047
High-efficiency metal membrane element, filter, and process for making
Inventor:
Robert S. Zeller
Patented Case
View Patent ↗
Granted: Jan 30, 1996
Filed: Jul 27, 1994
Inventor
Robert S. Zeller
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.