Granted Patent
Utility
US 6,048,446 · App. 09/175,387
Methods and apparatuses for engraving gravure cylinders
Inventor:
A. John Michaelis
Patented Case
View Patent ↗
Granted: Apr 11, 2000
Filed: Oct 20, 1998
Inventor
A. John Michaelis
Assignee (at issue)
R.R. DONNELLEY & SONS 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.