Granted Patent
Utility
US 4,466,931 · App. 06/405,226
Method for manufacturing microporous membrane
Inventor:
Gerald Tanny
Patented Case
View Patent ↗
Granted: Aug 21, 1984
Filed: Aug 5, 1982
Inventor
Gerald Tanny
Assignee (at issue)
Gelman Sciences
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.