Granted Patent
Utility
US 5,282,977 · App. 07/950,328
Separation of heavy metals from waste water of the titanium dioxide industry
Inventor:
Dieter Schinkitz
Patented Case
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Granted: Feb 1, 1994
Filed: Sep 24, 1992
Inventor
Dieter Schinkitz
Assignee (at issue)
Kronos, 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.