Granted Patent
Utility
US 6,444,601 · App. 09/602,827
Purified attapulgite clay
Inventors:
Robert J. Purcell, Dennis Parker
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Jun 23, 2000
Inventors
Robert J. Purcell
Dennis Parker
Assignee (at issue)
ITC 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.