Granted Patent
Utility
US 4,575,249 · App. 06/477,976
Method and device for measuring the density of color layers of printing inks that are still wet
Inventor:
Dieter Grieger
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Mar 23, 1983
Inventor
Dieter Grieger
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.