Granted Patent
Utility
US 6,508,993 · App. 09/595,033
Method for dissolving base metals and nobel metals from ores containing them
Inventors:
Dieter J. Schaefer, Matthias Grehl, Horst Meyer
Patented Case
View Patent ↗
Granted: Jan 21, 2003
Filed: Jun 16, 2000
Inventors
Dieter J. Schaefer
Matthias Grehl
Horst Meyer
Assignee (at issue)
W.C. Heraeus GmbH & Co. KG
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.