Granted Patent
Utility
US 5,728,270 · App. 08/751,435
Process for making the absorbent granular material
Inventors:
Edward G. Knapick, Brent Willemsen, Ernest P. Wolfer
Patented Case
View Patent ↗
Granted: Mar 17, 1998
Filed: Nov 18, 1996
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.