Granted Patent
Utility
US 4,727,705 · App. 06/937,752
Package for membrane filters
Inventor:
Joseph Zahka
Patented Case
View Patent ↗
Granted: Mar 1, 1988
Filed: Dec 4, 1986
Inventor
Joseph Zahka
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.