Granted Patent
Utility
US 5,391,850 · App. 08/188,009
Apparatus and method for fast hole drilling by electrical discharge machining
Inventor:
Rainer Mueller
Patented Case
View Patent ↗
Granted: Feb 21, 1995
Filed: Jan 28, 1994
Inventor
Rainer Mueller
Assignee (at issue)
Ford Motor Company
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.