Granted Patent
Utility
US 4,550,251 · App. 06/511,820
Image intensifier tube with increased contrast ratio
Inventors:
Louis T. Zitelli, Richard Schumacher
Patented Case
View Patent ↗
Granted: Oct 29, 1985
Filed: Jul 8, 1983
Inventors
Louis T. Zitelli
Richard Schumacher
Assignee (at issue)
Varian, Inc.
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.