Granted Patent
Utility
US 4,546,232 · App. 06/548,519
Method for the topically precise subsequent engraving of printing cylinders
Inventors:
Siegfried Beisswenger, Wolfgang Boppel
Patented Case
View Patent ↗
Granted: Oct 8, 1985
Filed: Nov 3, 1983
Inventors
Siegfried Beisswenger
Wolfgang Boppel
Assignee (at issue)
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.