Granted Patent
Utility
US 4,871,434 · App. 06/896,936
Process for equipment to coat tools for machining and forming techniques with mechanically resistant layers
Inventors:
Wolf-Dieter Munz, Bernd Hensel, Michael Scherer, Otto Knotek
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Aug 15, 1986
Inventors
Wolf-Dieter Munz
Bernd Hensel
Michael Scherer
Otto Knotek
Assignee (at issue)
Leybold-Heraeus GmbH
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.