Granted Patent
Utility
US 5,442,978 · App. 08/245,895
Tantalum production via a reduction of K2TAF7, with diluent salt, with reducing agent provided in a fast series of slug additions
Inventors:
Richard Hildreth, Malcolm Shaw, Terrance B. Tripp, Leo G. Gibbons
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: May 19, 1994
Inventors
Richard Hildreth
Malcolm Shaw
Terrance B. Tripp
Leo G. Gibbons
Assignee (at issue)
H.C. STARCK 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.