Granted Patent
Utility
US 5,882,480 · App. 08/852,419
Process for making granular material
Inventors:
Edward G. Knapick, Brent Willemsen, Ernest P. Wolfer
Patented Case
View Patent ↗
Granted: Mar 16, 1999
Filed: May 7, 1997
Inventors
Edward G. Knapick
Brent Willemsen
Ernest P. Wolfer
Assignee (at issue)
Marcal Paper Mills, Inc.
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.