Granted Patent
Utility
US 4,374,710 · App. 06/359,338
Electrolytic graining of aluminum with nitric and oxalic acids
Inventor:
John E. Walls
Patented Case
View Patent ↗
Granted: Feb 22, 1983
Filed: Mar 18, 1982
Inventor
John E. Walls
Assignee (at issue)
American Hoechst Corporation
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.