Granted Patent
Utility
US 4,275,040 · App. 06/154,680
Process for extracting titanium values from titaniferous bearing material
Inventor:
Brian Davis
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: May 30, 1980
Inventor
Brian Davis
Assignee (at issue)
NL Industries, 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.