Granted Patent
Utility
US 4,288,302 · App. 05/763,889
Method for electrowinning metal
Inventors:
Vittorio de Nora, Giuseppe Bianchi, Antonio Nidola
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Jan 31, 1977
Inventors
Vittorio de Nora
Giuseppe Bianchi
Antonio Nidola
Assignee (at issue)
Diamond Shamrock Technologies S.A.
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.