Granted Patent
Utility
US 5,137,633 · App. 07/721,737
Hydrophobic membrane having hydrophilic and charged surface and process
Inventor:
David Xuan-Qi Wang
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Jun 26, 1991
Inventor
David Xuan-Qi Wang
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.