Granted Patent
Utility
US 4,565,573 · App. 06/725,713
Purification of molten lead
Inventors:
Richard D. Symonds, Joseph E. Clapp, Kenneth Buckley
Patented Case
View Patent ↗
Granted: Jan 21, 1986
Filed: Apr 22, 1985
Inventors
Richard D. Symonds
Joseph E. Clapp
Kenneth Buckley
Assignee (at issue)
AMAX INCORPORATED
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.