Granted Patent
Utility
US 4,250,212 · App. 06/110,263
Wet strength paper additives
Inventor:
Donald N. Van Eenam
Patented Case
View Patent ↗
Granted: Feb 10, 1981
Filed: Jan 7, 1980
Inventor
Donald N. Van Eenam
Assignee (at issue)
Monsanto Company
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.