Granted Patent
Utility
US 6,087,448 · App. 08/974,126
Solid superabsorbent material containing a poly(vinylguanidine) and an acidic water-absorbing resin
Inventors:
Michael A. Mitchell, Thomas W. Beihoffer
Patented Case
View Patent ↗
Granted: Jul 11, 2000
Filed: Nov 19, 1997
Inventors
Michael A. Mitchell
Thomas W. Beihoffer
Assignee (at issue)
AMCOL INTERNATIONAL 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.