Granted Patent
Utility
US 4,501,862 · App. 06/526,304
Wet strength resin from aminopolyamide-polyureylene
Inventor:
Gerald I. Keim
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: Aug 26, 1983
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.