Granted Patent
Utility
US 4,566,943 · App. 06/673,837
Wet strength material
Inventors:
Per E. A. Hansson, Felek Jachimowicz
Patented Case
View Patent ↗
Granted: Jan 28, 1986
Filed: Nov 21, 1984
Inventors
Per E. A. Hansson
Felek Jachimowicz
Assignee (at issue)
W. R. Grace & Co.
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.