Granted Patent
Utility
US 5,188,514 · App. 07/608,141
Process for manufacturing an impeller by electrical discharge machining and articles so obtained
Inventors:
Dario Inserra, Marco Marzio, Paolo Pellizzari
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Nov 1, 1990
Inventors
Dario Inserra
Marco Marzio
Paolo Pellizzari
Assignee (at issue)
Varian, 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.