Granted Patent
Utility
US 5,972,164 · App. 08/972,072
Persulfate mixtures for repulping wet strength paper
Inventors:
Frank E. Caropreso, Dean S. Thorp, Robert H. Tieckelmann
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Nov 17, 1997
Inventors
Frank E. Caropreso
Dean S. Thorp
Robert H. Tieckelmann
Assignee (at issue)
FMC CORPORATION
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.