Granted Patent
Utility
US 4,908,236 · App. 07/286,429
Transparent porous membrane having hydrophilic surface and process
Inventors:
Aldo M. Pitt, Michael J. Steuck
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Dec 19, 1988
Inventors
Aldo M. Pitt
Michael J. Steuck
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.