Granted Patent
Utility
US 4,855,557 · App. 07/131,705
Electrical discharge machining electrode
Inventor:
Herman Carter Denny
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Dec 11, 1987
Inventor
Herman Carter Denny
Assignee (at issue)
Westinghouse Electric Company LLC
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.