Granted Patent
Utility
US 4,605,709 · App. 06/689,739
Wet strength resin from methylbis(aminopropyl)amine, oxalic acid ester, saturated aliphatic diester and epihalohydrin
Inventor:
William W. Maslanka
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Jan 8, 1985
Inventor
William W. Maslanka
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.