Granted Patent
Utility
US 4,537,657 · App. 06/663,105
Wet strength resins
Inventor:
Gerald I. Keim
Patented Case
View Patent ↗
Granted: Aug 27, 1985
Filed: Oct 22, 1984
Inventor
Gerald I. Keim
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.