Granted Patent
Utility
US 5,644,021 · App. 08/487,782
Synthesis of high solids-content wet-strength resin
Inventor:
William Ivalter Maslanka
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Jun 7, 1995
Inventor
William Ivalter 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.