Granted Patent
Utility
US 4,631,579 · App. 06/680,820
Method and apparatus for the production of color separations for single color printing
Inventors:
Ingo Hoffrichter, Eggert Jung
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Dec 12, 1984
Inventors
Ingo Hoffrichter
Eggert Jung
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.