Granted Patent
Utility
US 4,513,121 · App. 06/476,584
Wet strength material
Inventors:
Per E. A. Hansson, Felek Jachimowicz
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: Mar 18, 1983
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.