Granted Patent
Utility
US 4,537,470 · App. 06/438,989
Screen systems for multicolor printing
Inventor:
Johannes Schoppmeyer
Patented Case
View Patent ↗
Granted: Aug 27, 1985
Filed: Nov 4, 1982
Inventor
Johannes Schoppmeyer
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.