Granted Patent
Utility
US 4,820,390 · App. 07/069,865
Apparatus and method for continuous electrochemical machining of strip material
Inventor:
John E. Schuster
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jul 6, 1987
Inventor
John E. Schuster
Assignee (at issue)
The Interlake Companies, Inc.
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.