Granted Patent
Utility
US 4,812,913 · App. 07/147,321
Diaphragm arrangement for opto-electronic scanning of originals
Inventors:
Hans-Georg Knop, Jorg Schulz-Hennig
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Jan 22, 1988
Inventors
Hans-Georg Knop
Jorg Schulz-Hennig
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.