Granted Patent
Utility
US 6,383,459 · App. 09/652,517
Method for purifying a tantalum compound using a fluoride compound and sulfuric acid
Inventors:
Raj Pal Singh, Michael J. Miller
Patented Case
View Patent ↗
Granted: May 7, 2002
Filed: Aug 31, 2000
Inventors
Raj Pal Singh
Michael J. Miller
Assignee (at issue)
OSRAM SYLVANIA 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.