Granted Patent
Utility
US 4,438,374 · App. 06/403,512
Control of electric discharge lamps for scanning purposes
Inventor:
Helmut Karius
Patented Case
View Patent ↗
Granted: Mar 20, 1984
Filed: Jul 13, 1982
Inventor
Helmut Karius
Assignee (at issue)
Dr.-Ing. Rudolf Hell G.m.b.H.
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.