Granted Patent
Utility
US 4,299,683 · App. 06/169,648
Apparatus and method for efficient transfer of powdered ore
Inventors:
Vincent C. Adorno, Elizabeth A. Fessenden, Stephen R. Barr, Zebulon T. Gibson, Jr., John P. Carroll
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Jul 17, 1980
Inventors
Vincent C. Adorno
Elizabeth A. Fessenden
Stephen R. Barr
Zebulon T. Gibson, Jr.
John P. Carroll
Assignee (at issue)
Aluminum Company of America
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.