Granted Patent
Utility
US 6,238,632 · App. 09/457,592
Process and composition for removing precious metals from activated carbon
Inventor:
Martin Kamps
Patented Case
View Patent ↗
Granted: May 29, 2001
Filed: Dec 9, 1999
Inventor
Martin Kamps
Assignee (at issue)
Ashland, 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.