Granted Patent
Utility
US 5,269,917 · App. 07/843,496
Filtration apparatus having stress relief groove
Inventor:
Ralph Stankowski
Patented Case
View Patent ↗
Granted: Dec 14, 1993
Filed: Feb 28, 1992
Inventor
Ralph Stankowski
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.