Granted Patent
Utility
US 4,631,171 · App. 06/734,944
Copper-zinc-manganese-nickel alloys
Inventors:
Allen S. McDonald, Charles W. Philp, Thomas A. Sperakis
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: May 16, 1985
Inventors
Allen S. McDonald
Charles W. Philp
Thomas A. Sperakis
Assignee (at issue)
Handy & Harman
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.