Granted Patent
Utility
US 5,316,623 · App. 07/803,862
Absorbance and permanent wet-strength in tissue and toweling paper
Inventor:
Herbert H. Espy
Patented Case
View Patent ↗
Granted: May 31, 1994
Filed: Dec 9, 1991
Inventor
Herbert H. Espy
Assignee (at issue)
HERCULES LLC
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.