Granted Patent
Utility
US 4,328,443 · App. 06/129,469
Apparatus for providing improved characteristics of a broad area electron beam
Inventor:
Oswald L. Zappa
Patented Case
View Patent ↗
Granted: May 4, 1982
Filed: Mar 11, 1980
Inventor
Oswald L. Zappa
Assignee (at issue)
AVCO Everett Research Laboratory, 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.