Granted Patent
Utility
US 4,733,046 · App. 06/931,444
Pressure-tight vacuum chamber of an electron beam engraving machine for electron beam engraving of printing cylinders for printing technology
Inventors:
Rolf Angelbeck, Reinhard Gesell, Hans Penza
Patented Case
View Patent ↗
Granted: Mar 22, 1988
Filed: Aug 28, 1986
Inventors
Rolf Angelbeck
Reinhard Gesell
Hans Penza
Assignee (at issue)
Dr. Ing. Rudolf Hell 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.